Переключение между действиями андроидов вызывает сбой

Question

У меня есть основное приложение звуковой машины и с большой помощью наконец удалось заставить звуки играть и перестать играть, нажав кнопку «Назад». Теперь проблема заключается в том, что я загружаю экран и воспроизвожу звук, нажимаю кнопку «Назад» и пытаюсь воспроизвести новый звук, и вся сила приложения закрывается. здесь есть home.java и два звуковых класса Java.

package com.androidsleepmachine.gamble; 


import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TabHost; 
import android.widget.TabHost.TabSpec; 

public class Home extends Activity implements View.OnClickListener { 
Button Sleep1; 
Button Sleep2; 
Button Sleep3; 
Button Relax1; 
Button Relax2; 
Button Relax3; 
Button Well1; 
Button Well2; 
Button Well3; 

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

    TabHost tabHost = (TabHost) findViewById(R.id.tabHost); 
    tabHost.setup(); 
    TabSpec spec1 = tabHost.newTabSpec("Sleep"); 
    spec1.setContent(R.id.tab1); 
    spec1.setIndicator("Sleep", 
getResources().getDrawable(R.drawable.sleep_icon)); 

    TabSpec spec2 = tabHost.newTabSpec("Relaxation"); 
    spec2.setIndicator("Relaxation",  
getResources().getDrawable(R.drawable.zen_icon)); 
    spec2.setContent(R.id.tab2); 

    TabSpec spec3 = tabHost.newTabSpec("Wellness"); 
    spec3.setIndicator("Wellness", 
getResources().getDrawable(R.drawable.brain_icon)); 
    spec3.setContent(R.id.tab3); 

    tabHost.addTab(spec1); 
    tabHost.addTab(spec2); 
    tabHost.addTab(spec3); 
    Sleep1 = (Button) findViewById(R.id.button1); 
    Sleep1.setOnClickListener(this); 
    Sleep2 = (Button) findViewById(R.id.button2); 
    Sleep2.setOnClickListener(this); 
    Sleep3 = (Button) findViewById(R.id.button3); 
    Sleep3.setOnClickListener(this); 
    Relax1 = (Button) findViewById(R.id.button4); 
    Relax1.setOnClickListener(this); 
    Relax2 = (Button) findViewById(R.id.button5); 
    Relax2.setOnClickListener(this); 
    Relax3 = (Button) findViewById(R.id.button6); 
    Relax3.setOnClickListener(this); 
    Well1 = (Button) findViewById(R.id.button7); 
    Well1.setOnClickListener(this); 
    Well2 = (Button) findViewById(R.id.button8); 
    Well2.setOnClickListener(this); 
    Well3 = (Button) findViewById(R.id.button9); 
    Well3.setOnClickListener(this); 
} 

// Handle button callbacks 
@Override 
public void onClick(View v) { 
    switch (v.getId()) { 
     case R.id.button1: 
      Intent a = new Intent(this, Ocean.class); 
      startActivity(a); 
      break; 
     case R.id.button2: 
      Intent i = new Intent(this, Ship.class); 
      startActivity(i); 
      break; 
     case R.id.button3: 
      Intent c = new Intent(this, OceanThunder.class); 
      startActivity(c); 
      break; 
    } 
} 
} 

Вот Ocean.Java

package com.androidsleepmachine.gamble; 

import android.app.Activity; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.os.Handler; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.Spinner; 

public class Ocean extends Activity implements View.OnClickListener { 
public static final Integer[] TIME_IN_MINUTES = { 30, 45, 60, 180, 360 }; 
public MediaPlayer mediaPlayer; 
public Handler handler = new Handler(); 
public Button button1; 
public Spinner spinner1; 

// Initialize the activity 
@Override 
public void onCreate(Bundle bundle) { 
    super.onCreate(bundle); 
    setContentView(R.layout.ocean); 

    button1 = (Button) findViewById(R.id.btn1); 
    button1.setOnClickListener(this); 
    spinner1 = (Spinner) findViewById(R.id.spinner1); 
    ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this, 
android.R.layout.simple_spinner_item, TIME_IN_MINUTES); 

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);   
    spinner1.setAdapter(adapter); 
} 
    protected void onStop() 
    { 
    if (this.mediaPlayer != null) 
     this.mediaPlayer.stop(); 
    super.onStop(); 
    } 

// Play the sound and start the timer 
private void playSound(int resourceId) { 
    // Cleanup any previous sound files 
    cleanup(); 
    // Create a new media player instance and start it 
    mediaPlayer = MediaPlayer.create(this, resourceId); 
    mediaPlayer.start(); 
    // Create the timer to stop the sound after x number of milliseconds 
    int selectedTime = TIME_IN_MINUTES[spinner1.getSelectedItemPosition()]; 
    handler.postDelayed(runnable, selectedTime * 60 * 1000); 
} 

// Handle button callback 
@Override 
public void onClick(View v) { 
    switch (v.getId()) { 
     case R.id.btn1: 
      playSound(R.raw.ocean_birds); 
      break; 
    } 
} 

// Stop the sound and cleanup the media player 
public void cleanup() { 
    if (mediaPlayer != null) { 
     mediaPlayer.stop(); 
     mediaPlayer.release(); 
     mediaPlayer = null; 
    } 
    // Cancel any previously running tasks 
    handler.removeCallbacks(runnable); 
} 

// Runnable task used by the handler to stop the sound 
public Runnable runnable = new Runnable() { 
    public void run() { 
     cleanup(); 
    } 
}; 

и Ship.Java

package com.androidsleepmachine.gamble; 

import android.app.Activity; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.os.Handler; 
import android.view.KeyEvent; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.Spinner; 

public class Ship extends Activity implements View.OnClickListener { 
public static final Integer[] TIME_IN_MINUTES = { 30, 45, 60, 180, 360 }; 
public MediaPlayer mediaPlayer; 
public Handler handler = new Handler(); 
public Button button2; 
public Spinner spinner2; 

// Initialize the activity 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.ship); 



    button2 = (Button) findViewById(R.id.btn2); 
    button2.setOnClickListener(this); 
    spinner2 = (Spinner) findViewById(R.id.spinner2); 
    ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,  
android.R.layout.simple_spinner_item, TIME_IN_MINUTES); 

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);   
    spinner2.setAdapter(adapter); 
} 

    protected void onStop() 
    { 
    if (this.mediaPlayer != null) 
     this.mediaPlayer.stop(); 
    super.onStop(); 
    } 

// Play the sound and start the timer 
private void playSound(int resourceId) { 
    // Cleanup any previous sound files 
    cleanup(); 
    // Create a new media player instance and start it 
    mediaPlayer = MediaPlayer.create(this, resourceId); 
    mediaPlayer.start(); 
    // Create the timer to stop the sound after x number of milliseconds 
    int selectedTime = TIME_IN_MINUTES[spinner2.getSelectedItemPosition()]; 
    handler.postDelayed(runnable, selectedTime * 60 * 1000); 
} 

// Handle button callback 
@Override 
public void onClick(View v) { 
    switch (v.getId()) { 
     case R.id.btn2: 
      playSound(R.raw.ocean_ship); 
      break; 
    } 
} 

// Stop the sound and cleanup the media player 
public void cleanup() { 
    if (mediaPlayer != null) { 
     mediaPlayer.stop(); 
     mediaPlayer.release(); 
     mediaPlayer = null; 
    } 
    // Cancel any previously running tasks 
    handler.removeCallbacks(runnable); 
} 

// Runnable task used by the handler to stop the sound 
public Runnable runnable = new Runnable() { 
    public void run() { 
     cleanup(); 
    } 
}; 
} 

Logcat

09-19 14:58:17.533: D/dalvikvm(1675): GC_FOR_ALLOC freed 5637K, 22% free 40867K/51783K, paused 35ms, total 37ms 
09-19 14:58:17.533: I/dalvikvm-heap(1675): Grow heap (frag case) to 44.671MB for 4915212-byte allocation 
09-19 14:58:17.554: D/dalvikvm(1675): GC_CONCURRENT freed 2K, 12% free 45664K/51783K, paused 16ms+1ms, total 21ms 
09-19 14:58:17.688: D/dalvikvm(1675): GC_FOR_ALLOC freed 0K, 12% free 45664K/51783K, paused 33ms, total 33ms 
09-19 14:58:17.693: I/dalvikvm-heap(1675): Grow heap (frag case) to 53.004MB for 8739852-byte allocation 
09-19 14:58:17.713: D/dalvikvm(1675): GC_CONCURRENT freed 0K, 11% free 54199K/60359K, paused 13ms+2ms, total 20ms 
09-19 14:59:00.994: D/dalvikvm(1675): GC_FOR_ALLOC freed 4816K, 19% free 49464K/60359K, paused 35ms, total 40ms 
09-19 14:59:00.994: I/dalvikvm-heap(1675): Grow heap (frag case) to 52.286MB for 4096012-byte allocation 
09-19 14:59:01.014: D/dalvikvm(1675): GC_CONCURRENT freed 8K, 12% free 53455K/60359K, paused 13ms+1ms, total 21ms 
09-19 14:59:01.154: D/dalvikvm(1675): GC_FOR_ALLOC freed <1K, 12% free 53455K/60359K, paused 5ms, total 5ms 
09-19 14:59:01.154: I/dalvikvm-heap(1675): Forcing collection of SoftReferences for 7285488-byte allocation 
09-19 14:59:01.174: D/dalvikvm(1675): GC_BEFORE_OOM freed 9K, 12% free 53446K/60359K, paused 19ms, total 20ms 
09-19 14:59:01.174: E/dalvikvm-heap(1675): Out of memory on a 7285488-byte allocation. 
09-19 14:59:01.174: I/dalvikvm(1675): "main" prio=5 tid=1 RUNNABLE 
09-19 14:59:01.174: I/dalvikvm(1675): | group="main" sCount=0 dsCount=0 obj=0xb2e454b0 self=0xb9b594e0 
09-19 14:59:01.174: I/dalvikvm(1675): | sysTid=1675 nice=0 sched=0/0 cgrp=[fopen-error:2] handle=-1208622016 
09-19 14:59:01.174: I/dalvikvm(1675): | schedstat=(0 0 0) utm=158 stm=17 core=0 
09-19 14:59:01.184: I/dalvikvm(1675): at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:500) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:353) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:781) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.content.res.Resources.loadDrawable(Resources.java:1930) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.content.res.TypedArray.getDrawable(TypedArray.java:601) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.View.<init>(View.java:3336) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.View.<init>(View.java:3273) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.ViewGroup.<init>(ViewGroup.java:421) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.widget.RelativeLayout.<init>(RelativeLayout.java:184) 
09-19 14:59:01.184: I/dalvikvm(1675): at java.lang.reflect.Constructor.constructNative(Native Method) 
09-19 14:59:01.184: I/dalvikvm(1675): at java.lang.reflect.Constructor.newInstance(Constructor.java:417) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.LayoutInflater.createView(LayoutInflater.java:587) 
09-19 14:59:01.184: I/dalvikvm(1675): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.LayoutInflater.inflate(LayoutInflater.java:466) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
09-19 14:59:01.184: I/dalvikvm(1675): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.Activity.setContentView(Activity.java:1867) 
09-19 14:59:01.184: I/dalvikvm(1675): at com.androidsleepmachine.gamble.Ocean.onCreate(Ocean.java:23) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.Activity.performCreate(Activity.java:5008) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.os.Looper.loop(Looper.java:137) 
09-19 14:59:01.184: I/dalvikvm(1675): at android.app.ActivityThread.main(ActivityThread.java:4745) 
09-19 14:59:01.184: I/dalvikvm(1675): at java.lang.reflect.Method.invokeNative(Native Method) 
09-19 14:59:01.184: I/dalvikvm(1675): at java.lang.reflect.Method.invoke(Method.java:511) 
09-19 14:59:01.184: I/dalvikvm(1675): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
09-19 14:59:01.184: I/dalvikvm(1675): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
09-19 14:59:01.184: I/dalvikvm(1675): at dalvik.system.NativeStart.main(Native Method) 
09-19 14:59:01.204: A/libc(1675): Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 1675 (pmachine.gamble) 

Manafest

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

<uses-sdk 
    android:minSdkVersion="16" 
    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.androidsleepmachine.gamble.Home" 
     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.androidsleepmachine.gamble.Ship" /> 
    <activity android:name="com.androidsleepmachine.gamble.OceanThunder" /> 
    <activity android:name="com.androidsleepmachine.gamble.Ocean" /> 

</application> 

</manifest> 

Answer 1

Проблема, вероятно, здесь

protected void onStop() 
    { 
    if (this.mediaPlayer != null) 
     this.mediaPlayer.stop(); 
     super.onStop(); 
    } 

Я считаю, что вы должны называть mediaPlayer.release() здесь. Мой опыт работы с MediaPlayer на данный момент ограничен, но я считаю, что вызова stop() недостаточно. Вам нужно освободить ресурсы. Если это не сработает, вам нужно опубликовать полный логарифм, потому что если он разбился, значит, больше вашего логарифма, чем вы предоставили.

Это также может быть более безопасным в onPause().

Обновление от комментариев

protected void onStop() 
    { 
    if (this.mediaPlayer != null) 
     this.mediaPlayer.stop(); 
     mediaPlayer.release(); // release your resources 
     super.onStop(); 
    } 

, но как я уже сказал, это может быть безопаснее делать в onPause() вместо onStop(). Это будет работать, когда пользователь нажимает кнопку «Назад», но не будет, если что-то еще выходит на передний план.

Answer 2

Проверьте, обновили ли вы обновленный «манифест», это очень распространенная проблема. Наш ум настолько занят кодом, что мы часто забываем обновлять манифест.

Answer 3

код Magic is right. Вам нужно вызвать выпуск.

protected void onStop(){ 
    if (this.mediaPlayer != null){ 
     super.onStop(); 
     this.mediaPlayer.stop(); 
     this.mediaPlayer.release(); 
    } 

Это должно быть сделано.