如何使用碎片的安卓 [英] How to use Fragments in Android
问题描述
::请参阅我的回答如下...
问题:::
我很新的使用碎片的Android和我完全搞砸了。
我只是试图建立一个使用碎片一个简单的示例应用程序。我的情况是,我在我的主要活动两个片段。第一个片段有一个EditText和一个按钮。第二个片段有一个TextView。当我在EditText上输入一个名称,然后单击按钮,在第二个片段中的TextView应显示在第一个片段的EditText输入的名称。
我使用的片段静态分配(在XML中分配的碎片)。
请参阅XML文件和code以下...
activity_main.XML
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
<片段
机器人:ID =@ + ID / fragment_content_1
机器人:名称=com.example.fragmentexample.fragment_fragment_1
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
&所述; /片断>
<片段
机器人:ID =@ + ID / fragment_content_2
机器人:名称=com.example.fragmentexample.fragment_fragment_2
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
!< - preVIEW:布局= @布局/ fragment_basic - >
&所述; /片断>
< / LinearLayout中>
fragment_fragment_1.XML
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直>
<的EditText
机器人:ID =@ + ID / edtxtPersonName
机器人:layout_width =match_parent
机器人:layout_height =WRAP_CONTENT
机器人:EMS =10
机器人:inputType =textPersonName>
<不是requestFocus />
< /的EditText>
<按钮
机器人:ID =@ + ID / btnSayHi
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=打招呼/>
< / LinearLayout中>
fragment_fragment_2.XML
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直>
<的TextView
机器人:ID =@ + ID / txtViewResult
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=我会说你好/>
< / LinearLayout中>
Java文件:::
MainActivity.Java
包com.example.fragmentexample;
进口android.os.Bundle;
进口android.app.Activity;
进口android.view.Menu;
公共类MainActivity延伸活动{
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
}
@覆盖
公共布尔onCreateOptionsMenu(功能菜单){
//充气菜单;这增加了项目操作栏,如果它是present。
。getMenuInflater()膨胀(R.menu.activity_main,菜单);
返回true;
}
}
Fragment_1.Java
包com.example.fragmentexample;
进口android.app.Activity;
进口android.app.Fragment;
进口android.app.FragmentManager;
进口android.os.Bundle;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.view.ViewGroup;
进口android.widget.Button;
进口android.widget.EditText;
进口android.widget.Toast;
公共类Fragment_1扩展片段{
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
// TODO自动生成方法存根
查看查看= inflater.inflate(R.layout.fragment_fragment_1,集装箱,假);
最后的EditText edtxtPersonName_Fragment =(EditText上)view.findViewById(R.id.edtxtPersonName);
按钮btnSayHi_Fragment =(按钮)view.findViewById(R.id.btnSayHi);
btnSayHi_Fragment.setOnClickListener(新OnClickListener(){
@覆盖
公共无效的onClick(视图v){
// TODO自动生成方法存根
字符串名称= edtxtPersonName_Fragment.getText()的toString()。
FragmentManager FM = getFragmentManager();
Fragment_2 F2 =(Fragment_2)fm.findFragmentById(R.id.fragment_content_2);
如果(F2 = NULL和放大器;!&安培; f2.isInLayout())
{
f2.setName(名称);
}
活性活性= getActivity();
如果(活动!= NULL)
{
Toast.makeText(活动,说和放大器;正在进行荷兰国际集团喜......,Toast.LENGTH_LONG).show();
}
}
});
返回查看;
}
}
Fragment_2.Java
包com.example.fragmentexample;
进口android.app.Fragment;
进口android.os.Bundle;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.TextView;
公共类Fragment_2扩展片段{
查看图。
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
// TODO自动生成方法存根
鉴于= inflater.inflate(R.layout.fragment_fragment_2,集装箱,假);
返回查看;
}
公共无效setname可以(字符串名称)
{
TextView的txtName的=(的TextView)view.findViewById(R.id.txtViewResult);
txtName.setText(你好+姓名);
}
}
当我运行应用程序,也有一大堆例外。这里是logcat的痕迹。
04-16 15:06:48.781:E / AndroidRuntime(420):致命异常:主要
04-16 15:06:48.781:E / AndroidRuntime(420):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.example.fragmentexample / com.example.fragmentexample.MainActivity}:android.view.InflateException:二进制XML文件的第5行:错误充气类片段
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.ActivityThread.access $ 500(ActivityThread.java:122)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1024)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.os.Handler.dispatchMessage(Handler.java:99)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.os.Looper.loop(Looper.java:132)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.ActivityThread.main(ActivityThread.java:4123)
04-16 15:06:48.781:E / AndroidRuntime(420):在java.lang.reflect.Method.invokeNative(本机方法)
04-16 15:06:48.781:E / AndroidRuntime(420):在java.lang.reflect.Method.invoke(Method.java:491)
04-16 15:06:48.781:E / AndroidRuntime(420):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:841)
04-16 15:06:48.781:E / AndroidRuntime(420):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-16 15:06:48.781:E / AndroidRuntime(420):在dalvik.system.NativeStart.main(本机方法)
04-16 15:06:48.781:E / AndroidRuntime(420):android.view.InflateException:二进制XML文件中的行#5:错误充气类片段产生的原因
04-16 15:06:48.781:E / AndroidRuntime(420):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.view.LayoutInflater.inflate(LayoutInflater.java:479)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.view.LayoutInflater.inflate(LayoutInflater.java:391)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.view.LayoutInflater.inflate(LayoutInflater.java:347)
04-16 15:06:48.781:E / AndroidRuntime(420):在com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:223)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Activity.setContentView(Activity.java:1786)
04-16 15:06:48.781:E / AndroidRuntime(420):在com.example.fragmentexample.MainActivity.onCreate(MainActivity.java:12)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Activity.performCreate(Activity.java:4397)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
04-16 15:06:48.781:E / AndroidRuntime(420):11 ...更多
04-16 15:06:48.781:E / AndroidRuntime(420):android.app.Fragment $ InstantiationException:产生的原因无法实例片段com.example.fragmentexample.fragment_fragment_1:确保类名称存在,是公开的,并具有一个空的构造是公
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Fragment.instantiate(Fragment.java:567)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Fragment.instantiate(Fragment.java:535)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Activity.onCreateView(Activity.java:4168)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664)
04-16 15:06:48.781:E / AndroidRuntime(420):21 ...更多
04-16 15:06:48.781:E / AndroidRuntime(420):抛出java.lang.ClassNotFoundException:产生的原因com.example.fragmentexample.fragment_fragment_1装载机dalvik.system.PathClassLoader [/data/app/com.example.fragmentexample -1.apk]
04-16 15:06:48.781:E / AndroidRuntime(420):在dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251)
04-16 15:06:48.781:E / AndroidRuntime(420):在java.lang.ClassLoader.loadClass(ClassLoader.java:540)
04-16 15:06:48.781:E / AndroidRuntime(420):在java.lang.ClassLoader.loadClass(ClassLoader.java:500)
04-16 15:06:48.781:E / AndroidRuntime(420):在android.app.Fragment.instantiate(Fragment.java:557)
04-16 15:06:48.781:E / AndroidRuntime(420):24 ...更多
我看到的是如何做到这一点的例子,但不能看着办吧。请点区域在哪里,我做错了,也请张贴这样做的正确方法。
非常感谢你的时间......
::
我已经改变了MainActivity.java延长FragmentActivity,而不是活动也改变了android:name值在activity_main.xml指向的Java文件,而不是片段...
我得到以下异常:::
04-16 15:29:43.821:E / AndroidRuntime(563):致命异常:主要
04-16 15:29:43.821:E / AndroidRuntime(563):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.example.fragmentexample / com.example.fragmentexample.MainActivity}:android.view.InflateException:二进制XML文件的第5行:错误充气类片段
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.ActivityThread.access $ 500(ActivityThread.java:122)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1024)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.os.Handler.dispatchMessage(Handler.java:99)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.os.Looper.loop(Looper.java:132)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.ActivityThread.main(ActivityThread.java:4123)
04-16 15:29:43.821:E / AndroidRuntime(563):在java.lang.reflect.Method.invokeNative(本机方法)
04-16 15:29:43.821:E / AndroidRuntime(563):在java.lang.reflect.Method.invoke(Method.java:491)
04-16 15:29:43.821:E / AndroidRuntime(563):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:841)
04-16 15:29:43.821:E / AndroidRuntime(563):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-16 15:29:43.821:E / AndroidRuntime(563):在dalvik.system.NativeStart.main(本机方法)
04-16 15:29:43.821:E / AndroidRuntime(563):android.view.InflateException:二进制XML文件中的行#5:错误充气类片段产生的原因
04-16 15:29:43.821:E / AndroidRuntime(563):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.view.LayoutInflater.inflate(LayoutInflater.java:479)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.view.LayoutInflater.inflate(LayoutInflater.java:391)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.view.LayoutInflater.inflate(LayoutInflater.java:347)
04-16 15:29:43.821:E / AndroidRuntime(563):在com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:223)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.Activity.setContentView(Activity.java:1786)
04-16 15:29:43.821:E / AndroidRuntime(563):在com.example.fragmentexample.MainActivity.onCreate(MainActivity.java:13)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.Activity.performCreate(Activity.java:4397)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
04-16 15:29:43.821:E / AndroidRuntime(563):11 ...更多
04-16 15:29:43.821:E / AndroidRuntime(563):由:java.lang.ClassCastException:com.example.fragmentexample.Fragment_1不能转换为android.support.v4.app.Fragment
04-16 15:29:43.821:E / AndroidRuntime(563):在android.support.v4.app.Fragment.instantiate(Fragment.java:394)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.support.v4.app.Fragment.instantiate(Fragment.java:369)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
04-16 15:29:43.821:E / AndroidRuntime(563):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:660)
04-16 15:29:43.821:E / AndroidRuntime(563):21 ...更多
下面是activity_main.xml的改变XML文件
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
<片段
机器人:ID =@ + ID / fragment_content_1
机器人:名称=com.example.fragmentexample.Fragment_1
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
&所述; /片断>
<片段
机器人:ID =@ + ID / fragment_content_2
机器人:名称=com.example.fragmentexample.Fragment_2
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
!< - preVIEW:布局= @布局/ fragment_basic - >
&所述; /片断>
< / LinearLayout中>
Okie ...终于找到了解决办法。也许,这是没有太大的变化。
看看下面...
在codeactivity_main.XML
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
<片段
机器人:ID =@ + ID / fragment_content_1
机器人:名称=com.example.fragmentexample.Fragment_1
机器人:layout_width =0dip
机器人:layout_weight =0.50
机器人:layout_height =FILL_PARENT>
&所述; /片断>
<片段
机器人:ID =@ + ID / fragment_content_2
机器人:名称=com.example.fragmentexample.Fragment_2
机器人:layout_width =0dip
机器人:layout_weight =0.50
机器人:layout_height =FILL_PARENT>
!< - preVIEW:布局= @布局/ fragment_basic - >
&所述; /片断>
< / LinearLayout中>
fragment_fragment_1和fragment_fragment_2的布局保持不变。
Fragment_1.Java
包com.example.fragmentexample;
进口android.app.Activity;
进口android.app.Fragment;
进口android.app.FragmentManager;
进口android.os.Bundle;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.view.ViewGroup;
进口android.widget.Button;
进口android.widget.EditText;
进口android.widget.Toast;
公共类Fragment_1扩展片段{
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
// TODO自动生成方法存根
查看查看= inflater.inflate(R.layout.fragment_fragment_1,集装箱,假);
最后的EditText edtxtPersonName_Fragment =(EditText上)view.findViewById(R.id.edtxtPersonName);
按钮btnSayHi_Fragment =(按钮)view.findViewById(R.id.btnSayHi);
btnSayHi_Fragment.setOnClickListener(新OnClickListener(){
@覆盖
公共无效的onClick(视图v){
// TODO自动生成方法存根
字符串名称= edtxtPersonName_Fragment.getText()的toString()。
FragmentManager FM = getFragmentManager();
Fragment_2 F2 =(Fragment_2)fm.findFragmentById(R.id.fragment_content_2);
如果(F2 = NULL和放大器;!&安培; f2.isInLayout())
{
f2.setName(名称);
}
活性活性= getActivity();
如果(活动!= NULL)
{
Toast.makeText(活动,说和放大器;正在进行荷兰国际集团喜......,Toast.LENGTH_LONG).show();
}
}
});
返回查看;
}
}
Fragment_2.Java
包com.example.fragmentexample;
进口android.app.Fragment;
进口android.os.Bundle;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.TextView;
公共类Fragment_2扩展片段{
查看图。
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
// TODO自动生成方法存根
鉴于= inflater.inflate(R.layout.fragment_fragment_2,集装箱,假);
返回查看;
}
公共无效setname可以(字符串名称)
{
TextView的txtName的=(的TextView)view.findViewById(R.id.txtViewResult);
txtName.setText(你好+姓名);
}
}
下面是截图...
EDIT ::: Please refer to my answer below...
Question:::
I am very new to using Fragments in Android and I am completely messed up.
I am just trying to build a simple sample application that uses Fragments. My scenario is, I have two fragments in my main activity. The first fragment has an edittext and a button. The second fragment has a textview. When i enter a name in the edittext and click on the button, the textview in the second fragment should display the name entered in the edittext of the first fragment.
I am using static assignment of fragments (assigning fragments in XML).
Please refer to the XML files and Code below...
activity_main.XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/fragment_content_1"
android:name="com.example.fragmentexample.fragment_fragment_1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</fragment>
<fragment
android:id="@+id/fragment_content_2"
android:name="com.example.fragmentexample.fragment_fragment_2"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<!-- Preview: layout=@layout/fragment_basic -->
</fragment>
</LinearLayout>
fragment_fragment_1.XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/edtxtPersonName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
<Button
android:id="@+id/btnSayHi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Say Hi" />
</LinearLayout>
fragment_fragment_2.XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtViewResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I will say Hi" />
</LinearLayout>
Java Files :::
MainActivity.Java
package com.example.fragmentexample;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Fragment_1.Java
package com.example.fragmentexample;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Fragment_1 extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment_fragment_1, container, false);
final EditText edtxtPersonName_Fragment = (EditText) view.findViewById(R.id.edtxtPersonName);
Button btnSayHi_Fragment = (Button) view.findViewById(R.id.btnSayHi);
btnSayHi_Fragment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name = edtxtPersonName_Fragment.getText().toString();
FragmentManager fm = getFragmentManager();
Fragment_2 f2 = (Fragment_2) fm.findFragmentById(R.id.fragment_content_2);
if(f2 != null && f2.isInLayout())
{
f2.setName(name);
}
Activity activity = getActivity();
if(activity != null)
{
Toast.makeText(activity, "Say&ing Hi in Progress...", Toast.LENGTH_LONG).show();
}
}
});
return view;
}
}
Fragment_2.Java
package com.example.fragmentexample;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment_2 extends Fragment{
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view = inflater.inflate(R.layout.fragment_fragment_2, container, false);
return view;
}
public void setName(String name)
{
TextView txtName = (TextView) view.findViewById(R.id.txtViewResult);
txtName.setText("Hi " + name);
}
}
When I run the application, there are whole lot of exceptions.. Here is the logcat trace..
04-16 15:06:48.781: E/AndroidRuntime(420): FATAL EXCEPTION: main
04-16 15:06:48.781: E/AndroidRuntime(420): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentexample/com.example.fragmentexample.MainActivity}: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.access$500(ActivityThread.java:122)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.os.Looper.loop(Looper.java:132)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.main(ActivityThread.java:4123)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.reflect.Method.invokeNative(Native Method)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.reflect.Method.invoke(Method.java:491)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-16 15:06:48.781: E/AndroidRuntime(420): at dalvik.system.NativeStart.main(Native Method)
04-16 15:06:48.781: E/AndroidRuntime(420): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.inflate(LayoutInflater.java:391)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.inflate(LayoutInflater.java:347)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:223)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Activity.setContentView(Activity.java:1786)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.example.fragmentexample.MainActivity.onCreate(MainActivity.java:12)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Activity.performCreate(Activity.java:4397)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
04-16 15:06:48.781: E/AndroidRuntime(420): ... 11 more
04-16 15:06:48.781: E/AndroidRuntime(420): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.fragmentexample.fragment_fragment_1: make sure class name exists, is public, and has an empty constructor that is public
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Fragment.instantiate(Fragment.java:567)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Fragment.instantiate(Fragment.java:535)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Activity.onCreateView(Activity.java:4168)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664)
04-16 15:06:48.781: E/AndroidRuntime(420): ... 21 more
04-16 15:06:48.781: E/AndroidRuntime(420): Caused by: java.lang.ClassNotFoundException: com.example.fragmentexample.fragment_fragment_1 in loader dalvik.system.PathClassLoader[/data/app/com.example.fragmentexample-1.apk]
04-16 15:06:48.781: E/AndroidRuntime(420): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.ClassLoader.loadClass(ClassLoader.java:540)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.ClassLoader.loadClass(ClassLoader.java:500)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Fragment.instantiate(Fragment.java:557)
04-16 15:06:48.781: E/AndroidRuntime(420): ... 24 more
I have seen examples on how to do it, but couldn't figure it out. Please point the regions where i am doing it wrong, and also please post the correct way of doing it.
Thanks a lot for your time...
EDIT :::
I have changed the MainActivity.java to extend FragmentActivity instead of Activity and also changed the android:name values in the activity_main.xml to point to Java Files instead of fragments...
I get the following exceptions :::
04-16 15:29:43.821: E/AndroidRuntime(563): FATAL EXCEPTION: main
04-16 15:29:43.821: E/AndroidRuntime(563): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentexample/com.example.fragmentexample.MainActivity}: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.access$500(ActivityThread.java:122)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.os.Looper.loop(Looper.java:132)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.main(ActivityThread.java:4123)
04-16 15:29:43.821: E/AndroidRuntime(563): at java.lang.reflect.Method.invokeNative(Native Method)
04-16 15:29:43.821: E/AndroidRuntime(563): at java.lang.reflect.Method.invoke(Method.java:491)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-16 15:29:43.821: E/AndroidRuntime(563): at dalvik.system.NativeStart.main(Native Method)
04-16 15:29:43.821: E/AndroidRuntime(563): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.inflate(LayoutInflater.java:391)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.inflate(LayoutInflater.java:347)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:223)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.Activity.setContentView(Activity.java:1786)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.example.fragmentexample.MainActivity.onCreate(MainActivity.java:13)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.Activity.performCreate(Activity.java:4397)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
04-16 15:29:43.821: E/AndroidRuntime(563): ... 11 more
04-16 15:29:43.821: E/AndroidRuntime(563): Caused by: java.lang.ClassCastException: com.example.fragmentexample.Fragment_1 cannot be cast to android.support.v4.app.Fragment
04-16 15:29:43.821: E/AndroidRuntime(563): at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:660)
04-16 15:29:43.821: E/AndroidRuntime(563): ... 21 more
Here is the changed XML File of activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/fragment_content_1"
android:name="com.example.fragmentexample.Fragment_1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</fragment>
<fragment
android:id="@+id/fragment_content_2"
android:name="com.example.fragmentexample.Fragment_2"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<!-- Preview: layout=@layout/fragment_basic -->
</fragment>
</LinearLayout>
Okie... Finally found a solution. Probably, it wasn't much of a change.
Check out the code below...
activity_main.XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/fragment_content_1"
android:name="com.example.fragmentexample.Fragment_1"
android:layout_width="0dip"
android:layout_weight="0.50"
android:layout_height="fill_parent" >
</fragment>
<fragment
android:id="@+id/fragment_content_2"
android:name="com.example.fragmentexample.Fragment_2"
android:layout_width="0dip"
android:layout_weight="0.50"
android:layout_height="fill_parent" >
<!-- Preview: layout=@layout/fragment_basic -->
</fragment>
</LinearLayout>
The layouts of fragment_fragment_1 and fragment_fragment_2 remain the same.
Fragment_1.Java
package com.example.fragmentexample;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Fragment_1 extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment_fragment_1, container, false);
final EditText edtxtPersonName_Fragment = (EditText) view.findViewById(R.id.edtxtPersonName);
Button btnSayHi_Fragment = (Button) view.findViewById(R.id.btnSayHi);
btnSayHi_Fragment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name = edtxtPersonName_Fragment.getText().toString();
FragmentManager fm = getFragmentManager();
Fragment_2 f2 = (Fragment_2) fm.findFragmentById(R.id.fragment_content_2);
if(f2 != null && f2.isInLayout())
{
f2.setName(name);
}
Activity activity = getActivity();
if(activity != null)
{
Toast.makeText(activity, "Say&ing Hi in Progress...", Toast.LENGTH_LONG).show();
}
}
});
return view;
}
}
Fragment_2.Java
package com.example.fragmentexample;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment_2 extends Fragment{
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view = inflater.inflate(R.layout.fragment_fragment_2, container, false);
return view;
}
public void setName(String name)
{
TextView txtName = (TextView) view.findViewById(R.id.txtViewResult);
txtName.setText("Hi " + name);
}
}
Here is the ScreenShot...
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