找不到在活动课com.example.alexander.mobileapp02.MainActivity为onclick处理程序上的方法的sendMessage(查看) [英] Could not find a method sendMessage(View) in the activity class com.example.alexander.mobileapp02.MainActivity for onClick handler on
问题描述
我试着在网上寻找答案,但我怎么也找不到它。我希望有人知道如何解决这个ISEA,否则我真的不能再这个试用程序走。
这是我下面的教程,并在那里我结束了: http://developer.android.com/training/basics/firstapp/starting -activity.html (在网站上preSS previous到
我做了一个简单的应用程序,它会到主(第一/家庭)活动,那么你就输入您的姓名和preSS的按钮。 (见图片)。
当我preSS的按钮,这个错误出现: java.lang.IllegalStateException:找不到在活动课com.example.alexander.mobileapp02.MainActivity为onclick处理方法的sendMessage(视图)的视图类android.widget.Button (和应用程序,然后崩溃b.t.w。)
我只是要告诉整个应用程序:
下面完整的错误:
设备驱动程序的API版本:23
用户空间API版本:23
02-09 21:01:14.871 13128-13128 / com.example.alexander.mobileapp02 E /:马里:版本= Linux的r3p2-01rel3 BUILD_DATE =周五03月21日十三点52分五十秒KST 2014年
02-09 21:01:14.956 13128-13128 / com.example.alexander.mobileapp02 D / OpenGLRenderer:启用调试模式0
02-09 21:01:22.961 13128-13139 / com.example.alexander.mobileapp02 D / dalvikvm:GC_FOR_ALLOC释放257K,17%的自由7921K / 9456K,暂停21ms,共21ms
02-09 21:01:39.271 13128-13128 / com.example.alexander.mobileapp02 D / AndroidRuntime:关闭虚拟机
02-09 21:01:39.271 13128-13128 / com.example.alexander.mobileapp02 W / dalvikvm:主题ID = 1:螺纹未捕获异常退出(组= 0x41bd4c08)
02-09 21:01:39.281 13128-13128 / com.example.alexander.mobileapp02 E / AndroidRuntime:致命异常:主要
工艺:com.example.alexander.mobileapp02,PID:13128
java.lang.IllegalStateException:找不到在活动课com.example.alexander.mobileapp02.MainActivity为onclick处理方法的sendMessage(视图)的视图类android.widget.Button
在android.view.View $ 1.onClick(View.java:3970)
在android.view.View.performClick(View.java:4654)
在android.view.View $ PerformClick.run(View.java:19438)
在android.os.Handler.handleCallback(Handler.java:733)
在android.os.Handler.dispatchMessage(Handler.java:95)
在android.os.Looper.loop(Looper.java:146)
在android.app.ActivityThread.main(ActivityThread.java:5602)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:515)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1283)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
在dalvik.system.NativeStart.main(本机方法)
java.lang.NoSuchMethodException:产生的原因的sendMessage [类android.view.View]
在java.lang.Class.getConstructorOrMethod(Class.java:472)
在java.lang.Class.getMethod(Class.java:857)
在android.view.View $ 1.onClick(View.java:3963)
在android.view.View.performClick(View.java:4654)
在android.view.View $ PerformClick.run(View.java:19438)
在android.os.Handler.handleCallback(Handler.java:733)
在android.os.Handler.dispatchMessage(Handler.java:95)
在android.os.Looper.loop(Looper.java:146)
在android.app.ActivityThread.main(ActivityThread.java:5602)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:515)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1283)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
在dalvik.system.NativeStart.main(本机方法)
02-09 21:01:46.121 13128-13128 / com.example.alexander.mobileapp02 I /工艺:发送信号。 PID:13128 SIG:9
下面的fragment_main.xml:
<的LinearLayout
的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
机器人:方向=横向
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:以下属性来=@扪/ activity_horizontal_margin
机器人:paddingRight =@扪/ activity_horizontal_margin
机器人:paddingTop =@扪/ activity_vertical_margin
机器人:paddingBottom会=@扪/ activity_vertical_margin
工具:上下文=。MainActivity $ PlaceholderFragment
机器人:后台=#A9F5F2>
< EditText上机器人:ID =@ + ID / edit_message
机器人:layout_weight =1
机器人:layout_width =0dp
机器人:layout_height =WRAP_CONTENT
机器人:提示=@字符串/ edit_message/>
<按钮
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=@字符串/ button_send
机器人:的onClick =的sendMessage/>
< / LinearLayout中>
这是activity_display_message.xml
< RelativeLayout的的xmlns:机器人=http://schemas.android.com / APK / RES /安卓
的xmlns:工具=http://schemas.android.com/tools机器人:layout_width =match_parent
机器人:layout_height =match_parent机器人:以下属性来=@扪/ activity_horizontal_margin
机器人:paddingRight =@扪/ activity_horizontal_margin
机器人:paddingTop =@扪/ activity_vertical_margin
机器人:paddingBottom会=@扪/ activity_vertical_margin
工具:上下文=com.example.alexander.mobileapp02.DisplayMessageActivity>
< TextView的Android版本:文本=@字符串/参考hello world机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT/>
< / RelativeLayout的>
这是:activity_main.xml
<的FrameLayout的xmlns:机器人=http://schemas.android.com / APK / RES /安卓
的xmlns:工具=http://schemas.android.com/tools机器人:ID =@ + ID /容器
机器人:layout_width =match_parent机器人:layout_height =match_parent
MainActivity:工具上下文=工具:忽略=MergeRootFrame/>
字符串:的strings.xml
< XML版本=1.0编码=UTF-8? >
<资源>
<字符串名称=APP_NAME> MobileApp02< /串>
<字符串名称=参考hello world>世界,你好<!/串>
<字符串名称=action_settings>设置< /串>
<字符串名称=例题> example2string< /串>
<字符串名称=edit_message>输入您的姓名请< /串>
<字符串名称=button_send> START:D< /串>
<字符串名称=title_activity_main> MainActivity< /串>
<字符串名称=title_activity_display_message>我的留言和LT; /串>
< /资源>
活动的背景(有无关,与任何事情,但仍然) activitybackground.java:
包com.example.alexander.mobileapp02;
进口android.os.Bundle;
进口android.app.Activity;
进口android.view.Menu;
//开始另一个activty
公共类activitybackground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.menu_main,菜单);
返回true;
}
}
显示消息活动:DisplayMessageActivity.java:
包com.example.alexander.mobileapp02;
进口android.content.Intent;
进口android.support.v7.app.ActionBarActivity;
进口android.os.Bundle;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.widget.TextView;
公共类DisplayMessageActivity扩展ActionBarActivity {
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_display_message);
//从意图获取信息
意向意图= getIntent();
字符串消息= intent.getStringExtra(MyActivity.EXTRA_MESSAGE);
//创建文本视图
TextView中的TextView =新的TextView(本);
textView.setTextSize(40);
textView.setText(消息);
//设置文本视图作为活动布局
的setContentView(TextView的);
}
/ *
@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.menu_display_message,菜单);
返回true;
}
// * /
@覆盖
公共布尔onOptionsItemSelected(菜单项项){
//处理动作栏项目点击这里。将操作栏
//自动在主/向上按钮操作的点击,只要
//你在AndroidManifest.xml中指定一个父活动。
INT的id = item.getItemId();
// noinspection SimplifiableIfStatement
如果(ID == R.id.action_settings){
返回true;
}
返回super.onOptionsItemSelected(项目);
}
}
主要活动
MainActivity.java:
包com.example.alexander.mobileapp02;
进口android.content.Intent;
进口android.support.v7.app.ActionBarActivity;
进口android.support.v7.app.ActionBar;
进口android.support.v4.app.Fragment;
进口android.os.Bundle;
进口android.view.LayoutInflater;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.view.View;
进口android.view.ViewGroup;
进口android.os.Build;
进口android.widget.ImageButton;
进口android.widget.Toast;
公共类MainActivity扩展ActionBarActivity {
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
configureImageButton();
如果(savedInstanceState == NULL){
getSupportFragmentManager()的BeginTransaction()
。新增(R.id.container,新PlaceholderFragment())
。承诺();
}
/ *
的ImageButton按钮=(的ImageButton)findViewById(R.id.imageButton);
button.setOnClickListener(新View.OnClickListener(){
公共无效的onClick(视图v){
startActivity(新意图(MainActivity.this,activitybackground.class));
}
});
// * /
}
//}
私人无效configureImageButton(){
/ *
的ImageButton BTN =(的ImageButton)findViewById(R.id.imageButton);
btn.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
Toast.makeText(MainActivity.this,你单击该按钮!,Toast.LENGTH_LONG.show());
//改变图像按钮123
的ImageButton BTN =(的ImageButton)findViewById(R.id.imageButton);
btn.setImageResource(R.drawable.example_two);
}
});
// * /
/ *
的ImageButton按钮=(的ImageButton)findViewById(R.id.imageButton);
button.setOnClickListener(新View.OnClickListener(){
公共无效的onClick(视图v){
//
的ImageButton BTN =(的ImageButton)findViewById(R.id.imageButton);
btn.setImageResource(R.drawable.example_two);
}
});
// * /
}
@覆盖
公共布尔onCreateOptionsMenu(功能菜单){
// 123
//充气菜单;这增加了项目操作栏,如果它是present。
。getMenuInflater()膨胀(R.menu.menu_main,菜单);
返回true;
}
@覆盖
公共布尔onOptionsItemSelected(菜单项项){
//处理动作栏项目点击这里。将操作栏
//自动在主/向上按钮操作的点击,只要
//你在AndroidManifest.xml中指定一个父活动。
INT的id = item.getItemId();
// noinspection SimplifiableIfStatement
如果(ID == R.id.action_settings){
返回true;
}
返回super.onOptionsItemSelected(项目);
}
/ **
*包含一个简单的视图的占位符片段。
* /
公共静态类PlaceholderFragment扩展片段{
公共PlaceholderFragment(){
}
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout.fragment_main,集装箱,假);
返回rootView;
}
}
}
和MyActivity.java:
包com.example.alexander.mobileapp02;
进口android.content.Intent;
进口android.support.v7.app.ActionBarActivity;
进口android.view.View;
进口android.widget.EditText;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.Menu;
进口android.widget.EditText;
公共类MyActivity扩展ActionBarActivity {
公共最后静态字符串EXTRA_MESSAGE =com.example.alexander.mobileapp02.MESSAGE;
/ ** pressing启动按钮* /
公共无效的sendMessage(查看视图){
意向意图=新的意图(这一点,DisplayMessageActivity.class);
EditText上EDITTEXT =(EditText上)findViewById(R.id.edit_message);
字符串消息= editText.getText()的toString()。
intent.putExtra(EXTRA_MESSAGE,消息);
startActivity(意向);
}
}
现在阅读: fragment_main.xml显示按钮,在这里你可以输入你的名字。
activity_main.xml是没有什么(只是用一个空白页的Hello world!
现在,这是非常重要的。 activity_display_message.xml
本教程的状态,在这个环节(年底)的你现在可以运行应用程序。当它打开时,键入一条消息在文本字段中,点击发送,并在第二个活动显示的消息。 的
但是,当我输入的东西,preSS按钮我的应用程序崩溃,并且得到上面键入错误。
可有人帮忙吗?
老兄,错误的是明确的 -
找不到在活动类中的方法的sendMessage(查看) com.example.alexander.mobileapp02.MainActivity
当您在XML中声明这样一行 -
安卓的onClick =的sendMessage
您需要创建获取你的 MainActivity
,它需要执行的方法查看
调用它作为的参数。
公共无效的sendMessage(查看MyView的)
{
//你的code在这里
}
添加这在 MainActivity
,不是你的 MyActivity
并填写code,做了的sendMessage
。这不是魔术。
I tried to find the answer on internet, but I could not find it. I hope somebody knows how to solve this isea, since otherwise I cannot really go further with this tryout app.
This is the tutorial I follow and where I ended up: http://developer.android.com/training/basics/firstapp/starting-activity.html (on the site press previous to
I made a simple app, it goes to the main (first / home) activity, then you enter your name and press the button. (see images).
When I press the button, this error comes: java.lang.IllegalStateException: Could not find a method sendMessage(View) in the activity class com.example.alexander.mobileapp02.MainActivity for onClick handler on view class android.widget.Button (and the app then crashes b.t.w.)
I am just going to show the entire app:
Here the full error:
Device driver API version: 23
User space API version: 23
02-09 21:01:14.871 13128-13128/com.example.alexander.mobileapp02 E/﹕ mali: REVISION=Linux-r3p2-01rel3 BUILD_DATE=Fri Mar 21 13:52:50 KST 2014
02-09 21:01:14.956 13128-13128/com.example.alexander.mobileapp02 D/OpenGLRenderer﹕ Enabling debug mode 0
02-09 21:01:22.961 13128-13139/com.example.alexander.mobileapp02 D/dalvikvm﹕ GC_FOR_ALLOC freed 257K, 17% free 7921K/9456K, paused 21ms, total 21ms
02-09 21:01:39.271 13128-13128/com.example.alexander.mobileapp02 D/AndroidRuntime﹕ Shutting down VM
02-09 21:01:39.271 13128-13128/com.example.alexander.mobileapp02 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41bd4c08)
02-09 21:01:39.281 13128-13128/com.example.alexander.mobileapp02 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.alexander.mobileapp02, PID: 13128
java.lang.IllegalStateException: Could not find a method sendMessage(View) in the activity class com.example.alexander.mobileapp02.MainActivity for onClick handler on view class android.widget.Button
at android.view.View$1.onClick(View.java:3970)
at android.view.View.performClick(View.java:4654)
at android.view.View$PerformClick.run(View.java:19438)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoSuchMethodException: sendMessage [class android.view.View]
at java.lang.Class.getConstructorOrMethod(Class.java:472)
at java.lang.Class.getMethod(Class.java:857)
at android.view.View$1.onClick(View.java:3963)
at android.view.View.performClick(View.java:4654)
at android.view.View$PerformClick.run(View.java:19438)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
02-09 21:01:46.121 13128-13128/com.example.alexander.mobileapp02 I/Process﹕ Sending signal. PID: 13128 SIG: 9
Here the fragment_main.xml:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity$PlaceholderFragment"
android:background="#A9F5F2">
<EditText android:id="@+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="@string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_send"
android:onClick="sendMessage" />
</LinearLayout>
And this is the activity_display_message.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.alexander.mobileapp02.DisplayMessageActivity">
<TextView android:text="@string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
this is: activity_main.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container"
android:layout_width="match_parent" android:layout_height="match_parent"
tools:context=".MainActivity" tools:ignore="MergeRootFrame" />
the strings: strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">MobileApp02</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="example2">example2string</string>
<string name="edit_message">Enter your name please</string>
<string name="button_send">START :D</string>
<string name="title_activity_main">MainActivity</string>
<string name="title_activity_display_message">My Message</string>
</resources>
the activity background (which has nothing to do with anything yet, but still) activitybackground.java :
package com.example.alexander.mobileapp02;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
//starting another activty
public class activitybackground 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.menu_main, menu);
return true;
}
}
the display message activity: DisplayMessageActivity.java :
package com.example.alexander.mobileapp02;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class DisplayMessageActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_display_message);
//get message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MyActivity.EXTRA_MESSAGE);
//create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
//set the text view as the activity layout
setContentView(textView);
}
/*
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_display_message, menu);
return true;
}
//*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
the main activity
MainActivity.java :
package com.example.alexander.mobileapp02;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.ImageButton;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
configureImageButton();
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
/*
ImageButton button= (ImageButton) findViewById(R.id.imageButton);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,activitybackground.class));
}
});
//*/
}
//}
private void configureImageButton() {
/*
ImageButton btn = (ImageButton) findViewById(R.id.imageButton);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "You clicked the button!", Toast.LENGTH_LONG.show());
// change image on button 123
ImageButton btn = (ImageButton) findViewById(R.id.imageButton);
btn.setImageResource(R.drawable.example_two);
}
});
//*/
/*
ImageButton button = (ImageButton) findViewById(R.id.imageButton);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//
ImageButton btn = (ImageButton) findViewById(R.id.imageButton);
btn.setImageResource(R.drawable.example_two);
}
});
//*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// 123
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
and MyActivity.java :
package com.example.alexander.mobileapp02;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.EditText;
public class MyActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.alexander.mobileapp02.MESSAGE";
/** Pressing the start button */
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}
Now read this: fragment_main.xml shows the button and where you can enter your name.
activity_main.xml is nothing really (just an empty page with "Hello world!"
Now this is important. activity_display_message.xml
The tutorial states at the end of this link ( ) "You can now run the app. When it opens, type a message in the text field, click Send, and the message appears on the second activity."
But when I type something and press the button my app crashes and gets the error typed above.
Can anybody help please ?
Dude, the error is clear -
Could not find a method sendMessage(View) in the activity class com.example.alexander.mobileapp02.MainActivity
When you declare in XML a line like this -
android:onClick="sendMessage"
You need to create the method that gets executed in your MainActivity
, it takes the View
that called it as a parameter.
public void sendMessage(View myView)
{
//Your code here
}
Add this in your MainActivity
, not your MyActivity
and fill out the code that does the sendMessage
. It's not magic.
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