我有一个简单的应用程序(基于Android First App示例); 它唯一要做的就是显示一个EditText和一个按钮。当我点击按钮时,该按钮会创建另一个活动,并显示EditText消息... 简单!... 但在模拟器上运行时,当我点击按钮时应用程序会关闭并出现以下错误:
“找不到id为0x7f05003c(com.example.testapp:id / container)的视图,用于片段PlaceholderFragment {4173ead8 # 0 id = 0x7f05003c}” MainActivity.java
“找不到id为0x7f05003c(com.example.testapp:id / container)的视图,用于片段PlaceholderFragment {4173ead8 # 0 id = 0x7f05003c}” MainActivity.java
public class MainActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.testapp.MESSAGE";
public void SendMessage (View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edt_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
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;
}
}
}
activity_layout.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="com.example.testapp.MainActivity"
tools:ignore="MergeRootFrame" />
fragment_main.xml
<LinearLayout 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:orientation="horizontal" >
<EditText
android:id="@+id/edt_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="@string/Message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/textButtom"
android:onClick="SendMessage" />
</LinearLayout>
DisplayMessageActivity.java
public class DisplayMessageActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
TextView textView = new TextView(this);
textView.setTextSize (40);
textView.setText (message);
setContentView (textView);
}
@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();
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_display_message,
container, false);
return rootView;
}
}
}
activity_display_message.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="com.example.testapp.DisplayMessageActivity"
tools:ignore="MergeRootFrame" />
fragment_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" >
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.testapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.testapp.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.testapp.DisplayMessageActivity"
android:label="@string/title_activity_display_message"
android:parentActivityName="com.example.testapp.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.testapp.MainActivity" />
</activity>
</application>
</manifest>
LogCat
> 03-22 11:02:42.755: E/AndroidRuntime(1722):FATAL EXCEPTION: main 03-22
> 11:02:42.755: E/AndroidRuntime(1722):java.lang.RuntimeException:
> Unable to start activity ComponentInfo{com.example.testapp/
> com.example.testapp.DisplayMessageActivity}:java.lang.IllegalArgumentException:
> No view found for id 0x7f05003c (com.example.testapp:id/container) for
> fragment PlaceholderFragment{417356c8 #0 id=0x7f05003c} 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.ActivityThread.access$600(ActivityThread.java:141) 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.os.Handler.dispatchMessage(Handler.java:99) 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> android.os.Looper.loop(Looper.java:137) 03-22 11:02:42.755:
> E/AndroidRuntime(1722):at
> android.app.ActivityThread.main(ActivityThread.java:5103) 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> java.lang.reflect.Method.invokeNative(Native Method) 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> java.lang.reflect.Method.invoke(Method.java:525) 03-22 11:02:42.755:
> E/AndroidRuntime(1722):at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> dalvik.system.NativeStart.main(Native Method) 03-22 11:02:42.755:
> E/AndroidRuntime(1722):Caused by: java.lang.IllegalArgumentException:
> No view found for id 0x7f05003c (com.example.testapp:id/container) for
> fragment PlaceholderFragment{417356c8 #0 id=0x7f05003c} 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:919)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.Activity.performStart(Activity.java:5143) 03-22
> 11:02:42.755: E/AndroidRuntime(1722):at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
> 03-22 11:02:42.755: E/AndroidRuntime(1722):... 11 more 03-22
> 11:02:42.965: D/dalvikvm(1722): GC_FOR_ALLOC freed 206K, 9% free
> 2808K/3076K, paused 54ms, total 92ms 03-22 11:02:44.764:
> I/Process(1722): Sending signal. PID: 1722 SIG: 9