我有这段代码：
public class MainActivity extends ActionBarActivity {
TextView tv;
Button b1;
String answer;
RadioButton r1,r2,r3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
tv = (TextView) findViewById(R.id.textView1);
b1 =(Button) findViewById(R.id.button1);
r1 = (RadioButton) findViewById(R.id.radioButton1);
r2 = (RadioButton) findViewById(R.id.radioButton2);
r3 = (RadioButton) findViewById(R.id.radioButton3);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (r1.isChecked() == true) {
answer=null;
}else if (r2.isChecked() == true){
answer=null;
}else if (r3.isChecked() == true){
answer="correct";
}else{
answer="incorrect";
}
Intent i = new Intent(MainActivity.this , receiver.class);
i.putExtra("key" , answer);
startActivity(i);
}
});
但问题是应用程序在启动时不断崩溃。这是我的LogCat数据：
04-03 19:56:45.955: I/dalvikvm(620): Could not find method android.content.pm.PackageManager.getActivityLogo, referenced from method android.support.v7.internal.widget.ActionBarView.<init>
04-03 19:56:45.955: W/dalvikvm(620): VFY: unable to resolve virtual method 320: Landroid/content/pm/PackageManager;.getActivityLogo (Landroid/content/ComponentName;)Landroid/graphics/drawable/Drawable;
04-03 19:56:45.955: D/dalvikvm(620): VFY: replacing opcode 0x6e at 0x008b
04-03 19:56:45.955: I/dalvikvm(620): Could not find method android.content.pm.ApplicationInfo.loadLogo, referenced from method android.support.v7.internal.widget.ActionBarView.<init>
04-03 19:56:45.955: W/dalvikvm(620): VFY: unable to resolve virtual method 316: Landroid/content/pm/ApplicationInfo;.loadLogo (Landroid/content/pm/PackageManager;)Landroid/graphics/drawable/Drawable;
04-03 19:56:45.955: D/dalvikvm(620): VFY: replacing opcode 0x6e at 0x0099
04-03 19:56:45.965: D/dalvikvm(620): VFY: dead code 0x008e-0092 in Landroid/support/v7/internal/widget/ActionBarView;.<init> (Landroid/content/Context;Landroid/util/AttributeSet;)V
04-03 19:56:45.965: D/dalvikvm(620): VFY: dead code 0x009c-00a0 in Landroid/support/v7/internal/widget/ActionBarView;.<init> (Landroid/content/Context;Landroid/util/AttributeSet;)V
04-03 19:56:46.115: E/FragmentManager(620): No view found for id 0x7f05003c (com.example.radiogroup:id/container) for fragment PlaceholderFragment{4a312d58 #0 id=0x7f05003c}
04-03 19:56:46.115: E/FragmentManager(620): Activity state:
04-03 19:56:46.115: D/FragmentManager(620): Local FragmentActivity 4a2f4a18 State:
04-03 19:56:46.115: D/FragmentManager(620): mCreated=truemResumed=false mStopped=false mReallyStopped=false
04-03 19:56:46.115: D/FragmentManager(620): mLoadersStarted=false
04-03 19:56:46.115: D/FragmentManager(620): Active Fragments in 4a2f59e8:
04-03 19:56:46.125: D/FragmentManager(620): #0: PlaceholderFragment{4a312d58 #0 id=0x7f05003c}
04-03 19:56:46.125: D/FragmentManager(620): mFragmentId=#7f05003c mContainerId=#7f05003c mTag=null
04-03 19:56:46.125: D/FragmentManager(620): mState=0 mIndex=0 mWho=android:fragment:0 mBackStackNesting=0
04-03 19:56:46.125: D/FragmentManager(620): mAdded=true mRemoving=false mResumed=false mFromLayout=false mInLayout=false
04-03 19:56:46.125: D/FragmentManager(620): mHidden=false mDetached=false mMenuVisible=true mHasMenu=false
04-03 19:56:46.125: D/FragmentManager(620): mRetainInstance=false mRetaining=false mUserVisibleHint=true
04-03 19:56:46.136: D/FragmentManager(620): mFragmentManager=FragmentManager{4a2f59e8 in MainActivity{4a2f4a18}}
04-03 19:56:46.136: D/FragmentManager(620): mActivity=com.example.radiogroup.MainActivity@4a2f4a18
04-03 19:56:46.136: D/FragmentManager(620): Added Fragments:
04-03 19:56:46.136: D/FragmentManager(620): #0: PlaceholderFragment{4a312d58 #0 id=0x7f05003c}
04-03 19:56:46.136: D/FragmentManager(620): FragmentManager misc state:
04-03 19:56:46.136: D/FragmentManager(620): mActivity=com.example.radiogroup.MainActivity@4a2f4a18
04-03 19:56:46.145: D/FragmentManager(620): mContainer=android.support.v4.app.FragmentActivity$2@4a2f62f0
04-03 19:56:46.145: D/FragmentManager(620): mCurState=2 mStateSaved=false mDestroyed=false
04-03 19:56:46.145: D/FragmentManager(620): View Hierarchy:
04-03 19:56:46.145: D/FragmentManager(620): com.android.internal.policy.impl.PhoneWindow$DecorView{4a2f9580 V.E..... ... 0,0-0,0}
04-03 19:56:46.145: D/FragmentManager(620): android.widget.FrameLayout{4a2f9ec0 V.ED.... ... 0,0-0,0}
04-03 19:56:46.145: D/FragmentManager(620): android.widget.LinearLayout{4a2fabe0 V.E..... ... 0,0-0,0}
04-03 19:56:46.155: D/FragmentManager(620): android.support.v7.internal.widget.ActionBarContainer{4a2fb678 V.ED.... ... 0,0-0,0 #7f05001b app:id/action_bar_container}
04-03 19:56:46.155: D/FragmentManager(620): android.support.v7.internal.widget.ActionBarView{4a304040 V.E..... ... 0,0-0,0 #7f05001c app:id/action_bar}
04-03 19:56:46.155: D/FragmentManager(620): android.widget.LinearLayout{4a308948 G.....C. ... 0,0-0,0}
04-03 19:56:46.155: D/FragmentManager(620): android.widget.ImageView{4a309298 G.ED.... ... 0,0-0,0 #7f050021 app:id/up}
04-03 19:56:46.155: D/FragmentManager(620): android.widget.LinearLayout{4a3094c8 V.E..... ... 0,0-0,0}
04-03 19:56:46.155: D/FragmentManager(620): android.widget.TextView{4a309948 V.ED.... ... 0,0-0,0 #7f050022 app:id/action_bar_title}
04-03 19:56:46.165: D/FragmentManager(620): android.widget.TextView{4a30ab88 G.ED.... ... 0,0-0,0 #7f050023 app:id/action_bar_subtitle}
04-03 19:56:46.165: D/FragmentManager(620): android.support.v7.internal.widget.ActionBarView$HomeView{4a304f38 VFE...C. ... 0,0-0,0}
04-03 19:56:46.165: D/FragmentManager(620): android.widget.ImageView{4a307238 G.ED.... ... 0,0-0,0 #7f050021 app:id/up}
04-03 19:56:46.165: D/FragmentManager(620): android.widget.ImageView{4a307798 V.ED.... ... 0,0-0,0 #7f050014 app:id/home}
04-03 19:56:46.165: D/FragmentManager(620): android.support.v7.internal.widget.ActionBarContextView{4a30b558 G.E..... ... 0,0-0,0 #7f05001d app:id/action_context_bar}
04-03 19:56:46.175: D/FragmentManager(620): android.widget.FrameLayout{4a30bef0 V.ED.... ... 0,0-0,0 #1020002 android:id/content}
04-03 19:56:46.175: D/FragmentManager(620): android.widget.RelativeLayout{4a30d508 V.E..... ... 0,0-0,0}
04-03 19:56:46.175: D/FragmentManager(620): android.widget.RadioGroup{4a30dc08 V.E..... ... 0,0-0,0 #7f05003d app:id/radioGroup1}
04-03 19:56:46.175: D/FragmentManager(620): android.widget.TextView{4a30e108 V.ED.... ... 0,0-0,0 #7f05003e app:id/textView1}
04-03 19:56:46.175: D/FragmentManager(620): android.widget.Button{4a30e878 VFED..C. ... 0,0-0,0 #7f05003f app:id/button1}
04-03 19:56:46.175: D/FragmentManager(620): android.widget.RadioButton{4a30f470 VFED..C. ... 0,0-0,0 #7f050040 app:id/radioButton1}
04-03 19:56:46.185: D/FragmentManager(620): android.widget.RadioButton{4a310170 VFED..C. ... 0,0-0,0 #7f050041 app:id/radioButton2}
04-03 19:56:46.185: D/FragmentManager(620): android.widget.RadioButton{4a310b10 VFED..C. ... 0,0-0,0 #7f050042 app:id/radioButton3}
04-03 19:56:46.185: D/FragmentManager(620): android.support.v7.internal.widget.ActionBarContainer{4a30c198 G.ED.... ... 0,0-0,0 #7f05001e app:id/split_action_bar}
04-03 19:56:46.185: D/AndroidRuntime(620): Shutting down VM
04-03 19:56:46.185: W/dalvikvm(620): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
04-03 19:56:46.196: E/AndroidRuntime(620): FATAL EXCEPTION: main
04-03 19:56:46.196: E/AndroidRuntime(620): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.radiogroup/com.example.radiogroup.MainActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.example.radiogroup:id/container) for fragment PlaceholderFragment{4a312d58 #0 id=0x7f05003c}
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.os.Looper.loop(Looper.java:123)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-03 19:56:46.196: E/AndroidRuntime(620): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 19:56:46.196: E/AndroidRuntime(620): at java.lang.reflect.Method.invoke(Method.java:521)
04-03 19:56:46.196: E/AndroidRuntime(620): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-03 19:56:46.196: E/AndroidRuntime(620): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-03 19:56:46.196: E/AndroidRuntime(620): at dalvik.system.NativeStart.main(Native Method)
04-03 19:56:46.196: E/AndroidRuntime(620): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.example.radiogroup:id/container) for fragment PlaceholderFragment{4a312d58 #0 id=0x7f05003c}
04-03 19:56:46.196: E/AndroidRuntime(620): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:930)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.Activity.performStart(Activity.java:3781)
04-03 19:56:46.196: E/AndroidRuntime(620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2636)
04-03 19:56:46.196: E/AndroidRuntime(620): ... 11 more
那么这个错误的可能原因是什么？并提前感谢。我为我脆弱的语言道歉。
更新：fragment_main.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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.radiogroup.MainActivity$PlaceholderFragment" >
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="82dp"
android:layout_marginTop="136dp" >
</RadioGroup>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="21dp"
android:text="Which Vitamin helps clotting the blood ?"
android:textSize="30sp" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/radioGroup1"
android:layout_below="@+id/radioGroup1"
android:layout_marginTop="102dp"
android:text="Send"
android:textSize="30sp" />
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/radioGroup1"
android:layout_alignRight="@+id/button1"
android:text="RadioButton" />
<RadioButton
android:id="@+id/radioButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/radioGroup1"
android:layout_below="@+id/radioGroup1"
android:layout_marginTop="16dp"
android:text="RadioButton" />
<RadioButton
android:id="@+id/radioButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/button1"
android:layout_below="@+id/radioButton2"
android:text="RadioButton" />
</RelativeLayout>
答案 0 :(得分：1)
您似乎已将setContentView(R.layout.activity_main)更改为setContentView(R.layout.fragment_main)，但仍有模板生成的PlaceholderFragment事务尝试将片段置于视图{{1}在主活动布局中，找不到视图。
删除事务，或者按照模板要求的方式使用片段布局：在片段R.id.container中分离活动和片段布局以及设置监听器等。见NullPointerException accessing views in onCreate()
有关更多信息。