android - 活动不是从两个不同的开始，而是从一个开始

Question

我的应用程序中有几个活动。我想从其他两个单独的活动 B 和 C 开始一个活动，比如 A。从 BA 开始很好，从 C 开始它会通过 ANR 建议提醒我。考虑到：

  1. Activities are all declared in the Manifest
  2. There are no incoerent castings

这是必须打开的活动 A：

com.wikibuyers.aforismi 包；

 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.Writer;

 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.drawable.LayerDrawable;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewTreeObserver;
 import android.view.ViewTreeObserver.OnGlobalLayoutListener;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
 import android.widget.Button;
 import android.widget.ImageButton;
 import android.widget.Toast;


public class ElencoAforismiActivity extends Activity{

  public final static String EXTRA_MESSAGE = "com.example.provacomunicazionefraactivity.MESSAGE";

   @Override
   public void onCreate(Bundle savedInstanceState) 
   {
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.elecoalfabeticoautori);

  Button bottoneA = (Button)findViewById(R.id.buttonA);
  Button bottoneB = (Button)findViewById(R.id.buttonB);
  Button bottoneC = (Button)findViewById(R.id.buttonC);
  [...]
        Button bottoneX = (Button)findViewById(R.id.buttonX);
  Button bottoneY = (Button)findViewById(R.id.buttonY);
  Button bottoneZ = (Button)findViewById(R.id.buttonZ);
  ImageButton Preferiti = (ImageButton)findViewById(R.id.buttonPreferiti);


  bottoneA.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Button myButton = (Button) findViewById(R.id.buttonA ); 
             Animation anim = new AlphaAnimation(0.0f, 1.0f);// LAMPEGGIO BOTTONE 1
              anim.setDuration(20); //SI PUò CONTROLLARE LA DURATA DEL LAMPEGGIO CON QUESTO PARAMETRO
              anim.setStartOffset(20);
              anim.setRepeatMode(Animation.REVERSE);
              myButton.startAnimation(anim);
              anim.setRepeatCount(5);  
                 String message = "A" ;    

                Intent i = new Intent(getApplicationContext(), LetteraElencoSelezionataActivity.class);
                    i.putExtra(EXTRA_MESSAGE, message);
                   startActivity(i);  
        }
    });

  bottoneB.setOnClickListener(new View.OnClickListener() {

      @Override
        public void onClick(View v) {
            Button myButton = (Button) findViewById(R.id.buttonB ); 
             Animation anim = new AlphaAnimation(0.0f, 1.0f);// LAMPEGGIO BOTTONE 1
              anim.setDuration(20); //SI PUò CONTROLLARE LA DURATA DEL LAMPEGGIO CON QUESTO PARAMETRO
              anim.setStartOffset(20);
              anim.setRepeatMode(Animation.REVERSE);
              myButton.startAnimation(anim);
              anim.setRepeatCount(5);  
         String message = "B" ;    

        Intent i = new Intent(getApplicationContext(), LetteraElencoSelezionataActivity.class);
            i.putExtra(EXTRA_MESSAGE, message);
           startActivity(i);  
        }
    });

  bottoneC.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Button myButton = (Button) findViewById(R.id.buttonC ); 
             Animation anim = new AlphaAnimation(0.0f, 1.0f);// LAMPEGGIO BOTTONE 1

              anim.setDuration(20); //SI PUò CONTROLLARE LA DURATA DEL LAMPEGGIO CON QUESTO PARAMETRO
              anim.setStartOffset(20);
              anim.setRepeatMode(Animation.REVERSE);
              myButton.startAnimation(anim);

              anim.setRepeatCount(5);  

              String message = "C" ;    

                Intent i = new Intent(getApplicationContext(), LetteraElencoSelezionataActivity.class);
                    i.putExtra(EXTRA_MESSAGE, message);
                   startActivity(i);  
        }
    });


 [...omissis]

  Preferiti.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {ImageButton myButton = (ImageButton) findViewById(R.id.buttonPreferiti ); 
             Animation anim = new AlphaAnimation(0.0f, 1.0f);// LAMPEGGIO BOTTONE 1
              anim.setDuration(20); //SI PUò CONTROLLARE LA DURATA DEL LAMPEGGIO CON QUESTO PARAMETRO
              anim.setStartOffset(20);
              anim.setRepeatMode(Animation.REVERSE);
              myButton.startAnimation(anim);
              anim.setRepeatCount(5);  

        Intent i = new Intent(getApplicationContext(),  PreferitiActivity.class);
                //    i.putExtra(EXTRA_MESSAGE, message);
                   startActivity(i);  

        }
    });

      final Button BT1 = (Button)findViewById(R.id.buttonA);
        ViewTreeObserver vto1 = BT1.getViewTreeObserver();
        vto1.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
            @Override
            public void onGlobalLayout() {
                LayerDrawable ld1 = (LayerDrawable)BT1.getBackground();
                ld1.setLayerInset(1,0, 0, 0, BT1.getHeight()/2);}});

     final Button BT2 = (Button)findViewById(R.id.buttonB);
        ViewTreeObserver vto2 = BT2.getViewTreeObserver();
        vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
          @Override
          public void onGlobalLayout() {
                LayerDrawable ld1 = (LayerDrawable)BT2.getBackground();
                ld1.setLayerInset(1,0, 0, 0, BT2.getHeight()/2);}});

     final Button BT3 = (Button)findViewById(R.id.buttonC);
        ViewTreeObserver vto3 = BT3.getViewTreeObserver();
        vto3.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
        @Override
        public void onGlobalLayout() {
            LayerDrawable ld1 = (LayerDrawable)BT3.getBackground();
            ld1.setLayerInset(1,0, 0, 0, BT3.getHeight()/2);}});  

   [.........omissis]
     final Button BT16 = (Button)findViewById(R.id.buttonP);
        ViewTreeObserver vto16 = BT16.getViewTreeObserver();
        vto16.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
        @Override
        public void onGlobalLayout() {
        LayerDrawable ld1 = (LayerDrawable)BT16.getBackground();
        ld1.setLayerInset(1,0, 0, 0, BT16.getHeight()/2);}});

}

LogCat 是这样的：（对不起，我以前从未使用过）

 09-09 17:02:54.160: W/dalvikvm(21991): threadid=1: thread exiting with uncaught 
     exception         (group=0x41476930)
09-09 17:02:54.223: E/AndroidRuntime(21991): FATAL EXCEPTION: main
09-09 17:02:54.223: E/AndroidRuntime(21991): java.lang.RuntimeException: Unable to
start           activity ComponentInfo     
  {com.wikibuyers.aforismi/com.wikibuyers.
                                        java.lang.ArrayIndexOutOfBoundsException: length=48; 
 index=48
 09-09 17:02:54.223: E/AndroidRuntime(21991):   at   
 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
 09-09 17:02:54.223: E/AndroidRuntime(21991):   at
 android.app.ActivityThread.handleLaunchActivity  
  (ActivityThread.java:2230)
  09-09 17:02:54.223: E/AndroidRuntime(21991):
at android.app.ActivityThread.access$600(ActivityThread.java:141)
   09-09 17:02:54.223: E/AndroidRuntime(21991):     
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at android.os.Handler.dispatchMessage 
(Handler.java:99)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at android.os.Looper.loop(Looper.java:137)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at android.app.ActivityThread.main  
(ActivityThread.java:5039)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at java.lang.reflect.Method.invokeNative(Native  
Method)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at java.lang.reflect.Method.invoke  
(Method.java:511)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at   
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at com.android.internal.os.ZygoteInit.main  
(ZygoteInit.java:560)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at dalvik.system.NativeStart.main(Native Method)
09-09 17:02:54.223: E/AndroidRuntime(21991): Caused by:   
java.lang.ArrayIndexOutOfBoundsException: length=48; index=48
09-09 17:02:54.223: E/AndroidRuntime(21991):    at   
com.wikibuyers.aforismi.RandomActivity.onCreate  
(RandomActivity.java:1022)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at android.app.Activity.performCreate 
(Activity.java:5104)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at   
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-09 17:02:54.223: E/AndroidRuntime(21991):    at   
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
09-09 17:02:54.223: E/AndroidRuntime(21991):    ... 11 more
09-09 17:03:32.918: D/AndroidRuntime(22223): Shutting down VM
09-09 17:03:32.918: W/dalvikvm(22223): threadid=1: thread exiting with uncaught exception   
(group=0x41476930)
09-09 17:03:32.942: E/AndroidRuntime(22223): FATAL EXCEPTION: main
09-09 17:03:32.942: E/AndroidRuntime(22223): java.lang.RuntimeException: Unable to start   
activity ComponentInfo{com.wikibuyers.aforismi/com.wikibuyers.aforismi.PreferitiActivity}:   
java.lang.NullPointerException
09-09 17:03:32.942: E/AndroidRuntime(22223):    at   
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at   
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2230)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.app.ActivityThread.access$600 
(ActivityThread.java:141)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.app.ActivityThread$H.handleMessage 
(ActivityThread.java:1234)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.os.Handler.dispatchMessage  
(Handler.java:99)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.os.Looper.loop(Looper.java:137)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.app.ActivityThread.main  
(ActivityThread.java:5039)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at java.lang.reflect.Method.invokeNative(Native  
Method)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at java.lang.reflect.Method.invoke   
(Method.java:511)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at   
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at com.android.internal.os.ZygoteInit.main 
(ZygoteInit.java:560)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at dalvik.system.NativeStart.main(Native Method)
09-09 17:03:32.942: E/AndroidRuntime(22223): Caused by: java.lang.NullPointerException
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.app.ContextImpl.makeFilename   
(ContextImpl.java:1963)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.app.ContextImpl.openFileInput  
(ContextImpl.java:692)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.content.ContextWrapper.openFileInput  
(ContextWrapper.java:167)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at  
com.wikibuyers.aforismi.PreferitiActivity.onCreate(PreferitiActivity.java:49)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at android.app.Activity.performCreate 
(Activity.java:5104)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at  
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-09 17:03:32.942: E/AndroidRuntime(22223):    at  
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
09-09 17:03:32.942: E/AndroidRuntime(22223):    ... 11 more
09-09 17:03:57.676: I/Process(22223): Sending signal. PID: 22223 SIG: 9
09-09 17:03:57.981: D/OpenGLRenderer(22275): Enabling debug mode 0
09-09 17:04:04.801: D/AndroidRuntime(22275): Shutting down VM
09-09 17:04:04.801: W/dalvikvm(22275): threadid=1: thread exiting with uncaught exception  
(group=0x41476930)
09-09 17:04:04.817: E/AndroidRuntime(22275): FATAL EXCEPTION: main
09-09 17:04:04.817: E/AndroidRuntime(22275): java.lang.RuntimeException: Unable to start  
activity ComponentInfo{com.wikibuyers.aforismi/com.wikibuyers.aforismi.PreferitiActivity}:   
java.lang.NullPointerException
09-09 17:04:04.817: E/AndroidRuntime(22275):    at  
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at  
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2230)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.app.ActivityThread.access$600 
(ActivityThread.java:141)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.app.ActivityThread$H.handleMessage 
(ActivityThread.java:1234)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.os.Handler.dispatchMessage  
(Handler.java:99)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.os.Looper.loop(Looper.java:137)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.app.ActivityThread.main 
(ActivityThread.java:5039)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at java.lang.reflect.Method.invokeNative(Native   
Method)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at java.lang.reflect.Method.invoke 
(Method.java:511)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at  
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at com.android.internal.os.ZygoteInit.main  
(ZygoteInit.java:560)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at dalvik.system.NativeStart.main(Native Method)
09-09 17:04:04.817: E/AndroidRuntime(22275): Caused by: java.lang.NullPointerException
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.app.ContextImpl.makeFilename  
(ContextImpl.java:1963)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.app.ContextImpl.openFileInput  
(ContextImpl.java:692)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.content.ContextWrapper.openFileInput  
(ContextWrapper.java:167)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at  
com.wikibuyers.aforismi.PreferitiActivity.onCreate(PreferitiActivity.java:49)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at android.app.Activity.performCreate  
(Activity.java:5104) 
 09-09 17:04:04.817: E/AndroidRuntime(22275):   at  
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-09 17:04:04.817: E/AndroidRuntime(22275):    at   
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
09-09 17:04:04.817: E/AndroidRuntime(22275):    ... 11 more
09-09 17:04:04.832: D/dalvikvm(22275): GC_CONCURRENT freed 350K, 4% free 9283K/9664K, paused  
2ms+4ms, total 23ms

活动 PreferitiActivity.java 是这样的：

          package com.wikibuyers.aforismi;

 import java.io.FileNotFoundException;
 import java.io.OutputStreamWriter;
 import java.io.Reader;
 import java.io.InputStreamReader;
 import java.io.Writer;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 import android.widget.ArrayAdapter;
 import android.widget.ListView;
 import android.widget.Toast;

 import java.io.IOException;
 import java.util.ArrayList;


 public class PreferitiActivity extends Activity{

 public final static String EXTRA_MESSAGE = "com.example.provare.MESSAGE";



    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.preferiti);


      Intent intent = getIntent();
      String message = intent.getStringExtra(SingolaFraseSelezionataActivity.EXTRA_MESSAGE);


      Writer writer = null;

        try {
            //FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_APPEND);

            // SPOSTA IL SALVATAGGIO DEL FILE IN PREFERITI IN MODO DA AVERE SALVATAGGIO E LETTURA 
            // INSIEME E DA QUI MANDA SOLO LA FRASE AI PREFERITI

            writer = new OutputStreamWriter(openFileOutput(message,
                    MODE_PRIVATE));  //SE NON VA APPEND TORNIAMO A PRIVATE
            writer.write(message);
            Toast.makeText(getApplicationContext(), "Frase aggiunta ai Preferiti", Toast.LENGTH_LONG).show();
        }

              catch (IOException e) {
                    Log.e("Aforismi", "Impossibile salvare il file", e);
                    Toast.makeText(getApplicationContext(), "Errore", Toast.LENGTH_LONG).show();
                } finally {
                    if (writer != null) {
                        try {
                            writer.close();
                        } catch (Throwable t) {
                        }
                    }
                }

      Reader reader = null;
        try {
            reader = new InputStreamReader(openFileInput(message));

            StringBuffer aux = new StringBuffer();

            char[] buf = new char[1024];
            int len;
            while ((len = reader.read(buf)) != -1) {
                aux.append(buf, 0, len);
            }

        } catch (FileNotFoundException e) {
            message = "";

        } catch (IOException e) {
            Log.e("FileDemo", "Impossibile aprire il file", e);
            message = "";

        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (Throwable t) {
                }
            }
        }

        ArrayList<String> FrasiAggiuntePreferiti = new ArrayList<String>();

        FrasiAggiuntePreferiti.add(message);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.list_item, FrasiAggiuntePreferiti);

          ListView listView = (ListView) findViewById(R.id.listView3);
          listView.setAdapter(adapter);


    }
}

Answer 1

您的问题与 Array 越界有关：

java.lang.ArrayIndexOutOfBoundsException: length=48;

据我所知，这发生在 ActivityThread 类的第 2180 行。

最重要的是，您的代码中有一个逻辑错误，这会阻止您的 Activity 成功启动。修复你的数组“off by 1”错误，你应该被设置。

Answer 2

您是否在单击按钮时遇到异常？如果是这样，请检查您的活动开始代码

Intent i = new Intent(getApplicationContext(), PreferitiActivity.class);
 startActivity(i);

否则我想通过阅读您的错误消息，您必须在清单中定义活动 c

<activity android:name="com.wikibuyers.aforismi.C" >

编辑
你有一个 ArrayIndexOutOfBoundsException，你有列表，你没有发布的数组，它们导致了问题......干杯:)

Answer 3

由于我的策略发生了变化，我必须结束这次讨论。我知道我应该更好地使用数据库来实现我的目标，所以我将重写我的应用程序。感谢大家的宝贵答案。