片段中间体(II)中的片段Dynmically添加行,机器人 [英] Fragment Intermediate (II):Dynmically adding row in a fragment, Android
问题描述
我想在行片段动态添加到表中。
不过,我面临的一些运行时错误,严重需要一些建议。
logcat的:
1) E / AndroidRuntime(1038):了java.lang.RuntimeException:无法启动活动ComponentInfo {} com.example.lol/com.example.lol.MainActivity:android.view.InflateException :二进制XML文件行#96:错误充气类片段
2) E / AndroidRuntime(1038):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
3) E / AndroidRuntime(1038):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
FragmentTwo.Java
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.view.ViewGroup.LayoutParams;
进口android.widget.EditText;
进口android.widget.TableLayout;
进口android.widget.TableRow;
进口android.widget.TextView;公共类FragmentTwo扩展片段{ @覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,捆绑savedInstanceState)
{
查看查看= inflater.inflate(R.layout.fragment_two,集装箱,FALSE); TableLayout TL =(TableLayout)getActivity()findViewById(R.id.mainLayout)。
TR的TableRow =新的TableRow(getActivity()getApplicationContext());
// tr.setLayoutParams(新的LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
TextView的textview1 =新的TextView(getActivity()getApplicationContext());
textview1.setText(不高兴);
tr.addView(textview1); TextView的textview2 =新的TextView(getActivity()getApplicationContext());
textview2.setText(快乐);
tr.addView(textview2);
tl.addView(TR,新TableLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT)); 返回视图。
}
MainActivity.java
公共类MainActivity延伸活动{ @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
} 公共无效selectFrag(查看视图){
片段FR;
如果(查看== findViewById(R.id.button2)){
FR =新FragmentTwo(); }其他{
FR =新FragmentOne();
}
FragmentManager FM = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.replace(R.id.fragment_place,FR);
fragmentTransaction.commit(); }}
fragment_two.xml
<?XML版本=1.0编码=UTF-8&GT?;<的LinearLayout
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
机器人:背景=#FFFF00>
< TableLayout
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:ID =@ + ID / mainLayout> <的TableRow
机器人:ID =@ + ID / infoRow
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT> <的TextView
机器人:文字=不幸
机器人:ID =@ + ID /列1
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT>
< / TextView的> <的TextView
机器人:文字=快乐
机器人:ID =@ + ID /列2
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT>
< / TextView的>
< /&的TableRow GT;
< / TableLayout>
< / LinearLayout中>
更改此
TableLayout TL =(TableLayout)getActivity()findViewById(R.id.mainLayout)。
到
TableLayout TL =(TableLayout)view.findViewById(R.id.mainLayout);
这是一个错误,避免了 NullPointerException异常
。
和使用 getActivity()
初始化意见。要知道为什么读
<一个href=\"http://stackoverflow.com/questions/7298731/when-to-call-activity-context-or-application-context\">When调用活动上下文或应用程序上下文?
I am trying to dynamically add rows to a table in the fragment. However, I am facing some run-time error and seriously in need of some advice.
Logcat:
1)E/AndroidRuntime(1038): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lol/com.example.lol.MainActivity}: android.view.InflateException: Binary XML file line #96: Error inflating class fragment
2)E/AndroidRuntime(1038): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
3)E/AndroidRuntime(1038):at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2084)
FragmentTwo.Java
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.EditText;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
public class FragmentTwo extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_two, container, false);
TableLayout tl=(TableLayout) getActivity().findViewById(R.id.mainLayout);
TableRow tr = new TableRow(getActivity().getApplicationContext());
// tr.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
TextView textview1 = new TextView(getActivity().getApplicationContext());
textview1.setText("unhappy");
tr.addView(textview1);
TextView textview2 = new TextView(getActivity().getApplicationContext());
textview2.setText("happy");
tr.addView(textview2);
tl.addView(tr, new TableLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
return view;
}
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void selectFrag(View view) {
Fragment fr;
if(view == findViewById(R.id.button2)) {
fr = new FragmentTwo();
}else {
fr = new FragmentOne();
}
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.replace(R.id.fragment_place, fr);
fragmentTransaction.commit();
}
}
fragment_two.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"
android:background="#ffff00">
<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/mainLayout">
<TableRow
android:id="@+id/infoRow"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:text="Unhappy"
android:id="@+id/column1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
<TextView
android:text="Happy"
android:id="@+id/column2"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</TableRow>
</TableLayout>
</LinearLayout>
Change this
TableLayout tl=(TableLayout) getActivity().findViewById(R.id.mainLayout);
to
TableLayout tl=(TableLayout) view.findViewById(R.id.mainLayout);
This is one mistake which avoids NullPointerException
.
And use getActivity()
to initialize views. To know why read
When to call activity context OR application context?
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