OutOfMemoryError：背景可繪製 - Android

Question

幫幫我！ 我創建

MainActivity類別的Android項目：

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 
} 

和視圖activity_main.xml中：

<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" 
    tools:context=".MainActivity"> 
    <View 
     android:id="@+id/bg_1" 
     android:layout_height="wrap_content" 
     android:layout_width="wrap_content" 
     android:background="@drawable/bg_1" /> 
    <View 
     android:id="@+id/bg_2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:background="@drawable/bg_2"/> 
    <View 
     android:id="@+id/bg_3" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:background="@drawable/bg_3"/> 
</RelativeLayout> 

繪製對象文件夾包含三個圖像： bg_1.jpg（66K）， bg_2.jpg（190k）， bg_3.jpg（48k）

它看起來很簡單，但它thro w運行時出錯：

Caused by: java.lang.OutOfMemoryError 
      at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) 
      at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:514) 
      at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:359) 
      at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:786) 
      at android.content.res.Resources.loadDrawable(Resources.java:1969) 
      at android.content.res.TypedArray.getDrawable(TypedArray.java:601) 
      at android.view.View.<init>(View.java:3353) 
      at android.view.View.<init>(View.java:3290) 
            at java.lang.reflect.Constructor.constructNative(Native Method) 
            at java.lang.reflect.Constructor.newInstance(Constructor.java:417) 
            at android.view.LayoutInflater.createView(LayoutInflater.java:587) 
            at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56) 
            at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660) 
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685) 
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:746) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:409) 
            at android.app.Activity.setContentView(Activity.java:2087) 
            at com.example.hoa.test1.MainActivity.onCreate(MainActivity.java:12) 
            at android.app.Activity.performCreate(Activity.java:5238) 
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082) 
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2106) 
            at android.app.ActivityThread.access$600(ActivityThread.java:138) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1204) 
            at android.os.Handler.dispatchMessage(Handler.java:99) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:4904) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 
            at dalvik.system.NativeStart.main(Native Method) 

有人給我的原因和解決方案？ 非常感謝！

Answer 1

儘量減少你的images.Its的大小似乎你設備上存儲

Answer 2

低運行你的圖像看起來可能並不大，因爲它們的大小，但它是重要的分辨率。你可以自己擴展下來，或者您可以通過編程設定的圖像，並嘗試使用下面這個方法：

// Decodes image and scales it to reduce memory consumption 
private Bitmap decodeFile(File f) { 
try { 
    // Decode image size 
    BitmapFactory.Options o = new BitmapFactory.Options(); 
    o.inJustDecodeBounds = true; 
    BitmapFactory.decodeStream(new FileInputStream(f), null, o); 

    // The new size we want to scale to 
    final int REQUIRED_SIZE=70; 

    // Find the correct scale value. It should be the power of 2. 
    int scale = 1; 
    while(o.outWidth/scale/2 >= REQUIRED_SIZE && 
      o.outHeight/scale/2 >= REQUIRED_SIZE) { 
     scale *= 2; 
    } 

    // Decode with inSampleSize 
    BitmapFactory.Options o2 = new BitmapFactory.Options(); 
    o2.inSampleSize = scale; 
    return BitmapFactory.decodeStream(new FileInputStream(f), null, o2); 
} catch (FileNotFoundException e) {} 
return null; 
} 

有這裏有一個很好的閱讀太： http://developer.android.com/training/displaying-bitmaps/index.html

Answer 3

做出不同的屏幕密度不同的圖像大小（drawable-hdpi，drawable-xhdpi等）。