MainActivity.java
package com.example.myfirstapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
@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;
}
}
/** Called when the user clicks the Send button */
public void sendMessage(View view) {
// Do something in response to button
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);
}
}
DisplayMessageActivity.java
package com.example.myfirstapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
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();
}
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.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 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;
}
}
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myfirstapp.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.myfirstapp.DisplayMessageActivity"
android:label="@string/title_activity_display_message"
android:parentActivityName="com.example.myfirstapp.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myfirstapp.MainActivity" />
</activity>
</application>
</manifest>
logcat的
05-04 15:10:46.451: I/dalvikvm(26714): Debugger is active
05-04 15:10:46.561: I/System.out(26714): Debugger has connected
05-04 15:10:46.561: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:46.762: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:46.962: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:47.162: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:47.362: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:47.562: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:47.763: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:47.963: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:48.163: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:48.363: I/System.out(26714): waiting for debugger to settle...
05-04 15:10:48.574: I/System.out(26714): debugger has settled (1482)
05-04 15:10:49.154: I/Adreno-EGL(26714): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I6fa4c648a0ee7dc96f2718bf5d00dc891e0e766bDate: 02/06/14
05-04 15:10:49.194: D/OpenGLRenderer(26714): Enabling debug mode 0
05-04 15:10:49.384: I/Timeline(26714): Timeline: Activity_idle id: android.os.BinderProxy@41a3e538 time:30429837
05-04 15:11:00.847: I/Timeline(26714): Timeline: Activity_launch_request id:com.example.myfirstapp time:30441292
05-04 15:11:00.857: I/Choreographer(26714): Skipped 31 frames! The application may be doing too much work on its main thread.
05-04 15:11:01.017: E/FragmentManager(26714): No view found for id 0x7f05003c (com.example.myfirstapp:id/container) for fragment PlaceholderFragment{41b02f98 #0 id=0x7f05003c}
05-04 15:11:01.017: E/FragmentManager(26714): Activity state:
05-04 15:11:01.017: D/FragmentManager(26714): Local FragmentActivity 41af9790 State:
05-04 15:11:01.017: D/FragmentManager(26714): mCreated=truemResumed=false mStopped=false mReallyStopped=false
05-04 15:11:01.017: D/FragmentManager(26714): mLoadersStarted=false
05-04 15:11:01.027: D/FragmentManager(26714): Active Fragments in 41af9b30:
05-04 15:11:01.027: D/FragmentManager(26714): #0: PlaceholderFragment{41b02f98 #0 id=0x7f05003c}
05-04 15:11:01.027: D/FragmentManager(26714): mFragmentId=#7f05003c mContainerId=#7f05003c mTag=null
05-04 15:11:01.027: D/FragmentManager(26714): mState=0 mIndex=0 mWho=android:fragment:0 mBackStackNesting=0
05-04 15:11:01.027: D/FragmentManager(26714): mAdded=true mRemoving=false mResumed=false mFromLayout=false mInLayout=false
05-04 15:11:01.037: D/FragmentManager(26714): mHidden=false mDetached=false mMenuVisible=true mHasMenu=false
05-04 15:11:01.037: D/FragmentManager(26714): mRetainInstance=false mRetaining=false mUserVisibleHint=true
05-04 15:11:01.037: D/FragmentManager(26714): mFragmentManager=FragmentManager{41af9b30 in DisplayMessageActivity{41af9790}}
05-04 15:11:01.037: D/FragmentManager(26714): mActivity=com.example.myfirstapp.DisplayMessageActivity@41af9790
05-04 15:11:01.037: D/FragmentManager(26714): Added Fragments:
05-04 15:11:01.037: D/FragmentManager(26714): #0: PlaceholderFragment{41b02f98 #0 id=0x7f05003c}
05-04 15:11:01.037: D/FragmentManager(26714): FragmentManager misc state:
05-04 15:11:01.047: D/FragmentManager(26714): mActivity=com.example.myfirstapp.DisplayMessageActivity@41af9790
05-04 15:11:01.047: D/FragmentManager(26714): mContainer=android.support.v4.app.FragmentActivity$2@41af9ba8
05-04 15:11:01.047: D/FragmentManager(26714): mCurState=2 mStateSaved=false mDestroyed=false
05-04 15:11:01.047: D/FragmentManager(26714): View Hierarchy:
05-04 15:11:01.047: D/FragmentManager(26714): com.android.internal.policy.impl.PhoneWindow$DecorView{41afb608 V.E..... ... 0,0-0,0}
05-04 15:11:01.057: D/FragmentManager(26714): com.android.internal.widget.ActionBarOverlayLayout{41afbc48 V.ED.... ... 0,0-0,0 #1020322 android:id/action_bar_overlay_layout}
05-04 15:11:01.057: D/FragmentManager(26714): android.widget.FrameLayout{41afc858 V.E..... ... 0,0-0,0 #1020002 android:id/content}
05-04 15:11:01.057: D/FragmentManager(26714): android.widget.TextView{41b03248 V.ED.... ... 0,0-0,0}
05-04 15:11:01.067: D/FragmentManager(26714): com.android.internal.widget.ActionBarContainer{41afcc58 V.ED.... ... 0,0-0,0 #1020323 android:id/action_bar_container}
05-04 15:11:01.067: D/FragmentManager(26714): com.android.internal.widget.ActionBarView{41afd160 V.E..... ... 0,0-0,0 #1020324 android:id/action_bar}
05-04 15:11:01.067: D/FragmentManager(26714): android.widget.LinearLayout{41afd6d0 VFE...C. ... 0,0-0,0}
05-04 15:11:01.077: D/FragmentManager(26714): com.android.internal.widget.ActionBarView$HomeView{41afe7b0 V.E..... ... 0,0-0,0}
05-04 15:11:01.077: D/FragmentManager(26714): android.widget.ImageView{41afeb48 V.ED.... ... 0,0-0,0 #102025e android:id/up}
05-04 15:11:01.077: D/FragmentManager(26714): android.widget.ImageView{41afeea8 V.ED.... ... 0,0-0,0 #102002c android:id/home}
05-04 15:11:01.087: D/FragmentManager(26714): android.widget.LinearLayout{41b000a0 G.E..... ... 0,0-0,0}
05-04 15:11:01.087: D/FragmentManager(26714): android.widget.TextView{41b003b8 V.ED.... ... 0,0-0,0 #1020269 android:id/action_bar_title}
05-04 15:11:01.087: D/FragmentManager(26714): android.widget.TextView{41b01040 G.ED.... ... 0,0-0,0 #102026a android:id/action_bar_subtitle}
05-04 15:11:01.097: D/FragmentManager(26714): com.android.internal.widget.ActionBarContextView{41b01660 G.E..... ... 0,0-0,0 #1020325 android:id/action_context_bar}
05-04 15:11:01.097: D/FragmentManager(26714): com.android.internal.widget.ActionBarContainer{41b01b30 G.ED.... ... 0,0-0,0 #1020326 android:id/split_action_bar}
我一直在Nexus 4上测试它。该程序假设显示文本框中的任何内容，当发送＆＃34;发送＆＃34;按下按钮。相反，它只是崩溃说＆＃34;不幸的是，我的第一个应用程序停止了＃34;。
答案 0 :(得分：0)
以下是LogCat所说的问题：
No view found for id 0x7f05003c (com.example.myfirstapp:id/container) for fragment PlaceholderFragment{41b02f98 #0 id=0x7f05003c}
没有从占位符片段的onCreateView函数返回的视图（Null）：
View rootView = inflater.inflate(R.layout.fragment_display_message,
container, false);
您可以在布局中添加带有Id的framelayout，并将其用作PlaceHolderFragment类的占位符。然后在PlaceHolderFragment类的onCreateView中返回那个膨胀的视图