RuntimeException：無法實例化活動componentinfo Android

我想在android中編碼的東西，但我不能讓它在我的外部設備上工作。它總是強迫退出。我在android中編寫了一兩個東西，我總是能夠啓動它們，所以我不知道這個錯誤來自哪裏。RuntimeException：無法實例化活動componentinfo Android

這是發射活動的代碼：

package sander.bylemans.alarm; 

import java.util.ArrayList; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 

public class MainActivity extends ActionBarActivity { 

    final int setAlarm = 214; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Button add = (Button) findViewById(R.id.add); 
     add.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       startActivityForResult(new Intent(MainActivity.this,AlarmScreen.class), setAlarm); 
      } 
     }); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data){ 
     if(requestCode == setAlarm){ 
      if(resultCode == RESULT_OK){ 
       String name = data.getStringExtra("Name"); 
       String time = data.getStringExtra("Time"); //In h:m format 
       String days = data.getStringExtra("Days"); //Seperated by ; 

       String[] t = time.split(":"); 
       String[] d = days.split(";"); 

       int[] hrsAndMin = new int[t.length]; 
       for(int i = 0; i < t.length; i++){ 
        hrsAndMin[i] = Integer.parseInt(t[i]); 
       } 

       ArrayList<Day> ds = new ArrayList<Day>(); 
       for(int i = 0; i < d.length; i++){ 
        switch(d[i]){ 
        case("Monday"): 
         ds.add(Day.Monday); 
        case("Tuesday"): 
         ds.add(Day.Tuesday); 
        case("Wednesday"): 
         ds.add(Day.Wednesday); 
        case("Thursday"): 
         ds.add(Day.Thursday); 
        case("Friday"): 
         ds.add(Day.Friday); 
        case("Saturday"): 
         ds.add(Day.Saturday); 
        case("Sunday"): 
         ds.add(Day.Sunday); 
        } 
       } 

       Alarm alarm = new Alarm(name, hrsAndMin[0], hrsAndMin[1] , Status.ON, ds); 

       addAlarm(alarm); 
      } 
     } 
    } 

    @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); 
    } 

    private void addAlarm(Alarm alarm){ 

    } 
}

這是AndroidManifest.xml中：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="sander.bylemans.alarm" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="16" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="sander.bylemans.alarm.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="sander.bylemans.alarm.AlarmScreen" 
      android:label="@string/title_activity_alarm_screen" > 
     </activity> 
    </application> 

</manifest>

這是我收到的錯誤，我不知道如何解決：

10-27 20:56:52.278: W/dalvikvm(14367): Unable to resolve superclass of Lsander/bylemans/alarm/MainActivity; (4) 
10-27 20:56:52.278: W/dalvikvm(14367): Link of class 'Lsander/bylemans/alarm/MainActivity;' failed 
10-27 20:56:52.298: W/dalvikvm(14367): threadid=1: thread exiting with uncaught exception (group=0x4001d560) 
10-27 20:56:52.398: E/AndroidRuntime(14367): FATAL EXCEPTION: main 
10-27 20:56:52.398: E/AndroidRuntime(14367): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{sander.bylemans.alarm/sander.bylemans.alarm.MainActivity}: java.lang.ClassNotFoundException: sander.bylemans.alarm.MainActivity in loader dalvik.system.PathClassLoader[/data/app/sander.bylemans.alarm-2.apk] 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.os.Looper.loop(Looper.java:130) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.ActivityThread.main(ActivityThread.java:3687) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at java.lang.reflect.Method.invokeNative(Native Method) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at java.lang.reflect.Method.invoke(Method.java:507) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at dalvik.system.NativeStart.main(Native Method) 
10-27 20:56:52.398: E/AndroidRuntime(14367): Caused by: java.lang.ClassNotFoundException: sander.bylemans.alarm.MainActivity in loader dalvik.system.PathClassLoader[/data/app/sander.bylemans.alarm-2.apk] 
10-27 20:56:52.398: E/AndroidRuntime(14367): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at java.lang.ClassLoader.loadClass(ClassLoader.java:551) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
10-27 20:56:52.398: E/AndroidRuntime(14367): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565) 
10-27 20:56:52.398: E/AndroidRuntime(14367): ... 11 more

我搜索了很長時間的解決方案，似乎無法找到一個解決親blem。我嘗試了不同的東西，但都沒有工作。如果有人能幫助我，我會永遠感謝。

電賀

來源

2014-10-27 SBylemans

VM是無法找到android.support.v7.app.ActionBarActivity;檢查您的支持庫JAR的位置。它應該在項目的庫文件夾中工作

來源

2014-10-27 20:29:49 Rohit5k2

Android的支持，v4.jar是在那裏檢查，但我在Java構建路徑添加appcompat_v7在項目中。 – SBylemans 2014-10-27 20:33:37

appcompat_v7已經包含了android-support-v4.jar。嘗試從你的libs文件夾中刪除android-support-v4.jar。此支持庫的不同版本也可能導致此問題。 – Rohit5k2 2014-10-27 20:45:35

是的，就是這樣！謝謝！與其他項目，這是沒有問題的，這就是爲什麼我找不到它......非常感謝@ Rohit5k2 – SBylemans 2014-10-27 21:11:32

似乎所需的jar不在你的libs文件夾中。複製的jar到您的libs文件夾

您需要確保該庫在以下路徑

Go to Properties->Java Build Path->Order and Export and make sure the library is checked.

來源

2014-10-27 20:37:28 vembutech

RuntimeException：無法實例化活動componentinfo Android

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