android - getDrawable() 内存不足错误

Question

我想将当前图像设置为 Android 设备中的墙纸，并在缩放后将其设置为列表中的 ImageView 。我在做什么:

final WallpaperManager wm = WallpaperManager.getInstance(this);
final Drawable wallpaperDrawable = wm.getDrawable();
Bitmap bitmap = drawableToBitmap(wallpaperDrawable);
imageview.setImageBitmap(bitmap);

drawableToBitmap函数如下:

public static Bitmap drawableToBitmap (Drawable drawable) {
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable)drawable).getBitmap();
    }

    int width = drawable.getIntrinsicWidth();
    width = width > 0 ? width : 1;
    int height = drawable.getIntrinsicHeight();
    height = height > 0 ? height : 1;

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}

但是我得到这个错误:

01-29 13:30:50.150: E/dalvikvm-heap(3281): Out of memory on a 3891216-byte allocation.
    01-29 13:30:50.160: I/dalvikvm(3281): "main" prio=5 tid=1 RUNNABLE
    01-29 13:30:50.160: I/dalvikvm(3281):   | group="main" sCount=0 dsCount=0 obj=0x409c0460 self=0x12810
    01-29 13:30:50.170: I/dalvikvm(3281):   | sysTid=3281 nice=0 sched=0/0 cgrp=default handle=1074082952
    01-29 13:30:50.180: I/dalvikvm(3281):   | schedstat=( 1725234737 955825527 142 ) utm=152 stm=20 core=0
    01-29 13:30:50.190: I/dalvikvm(3281):   at android.graphics.Bitmap.nativeCreate(Native Method)
    01-29 13:30:50.190: I/dalvikvm(3281):   at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
    01-29 13:30:50.190: I/dalvikvm(3281):   at android.graphics.Bitmap.createBitmap(Bitmap.java:585)
    01-29 13:30:50.190: I/dalvikvm(3281):   at android.app.WallpaperManager.generateBitmap(WallpaperManager.java:729)
    01-29 13:30:50.190: I/dalvikvm(3281):   at android.app.WallpaperManager$Globals.getCurrentWallpaperLocked(WallpaperManager.java:265)
    01-29 13:30:50.200: I/dalvikvm(3281):   at android.app.WallpaperManager$Globals.peekWallpaperBitmap(WallpaperManager.java:230)
    01-29 13:30:50.200: I/dalvikvm(3281):   at android.app.WallpaperManager.getDrawable(WallpaperManager.java:350)
    01-29 13:30:50.210: I/dalvikvm(3281):   at storeapps.com.profilechanger.ListActivity.onCreate(ListActivity.java:64)
    01-29 13:30:50.210: I/dalvikvm(3281):   at android.app.Activity.performCreate(Activity.java:4466)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.app.ActivityThread.access$600(ActivityThread.java:123)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.os.Handler.dispatchMessage(Handler.java:99)
    01-29 13:30:50.220: I/dalvikvm(3281):   at android.os.Looper.loop(Looper.java:137)
    01-29 13:30:50.230: I/dalvikvm(3281):   at android.app.ActivityThread.main(ActivityThread.java:4424)
    01-29 13:30:50.230: I/dalvikvm(3281):   at java.lang.reflect.Method.invokeNative(Native Method)
    01-29 13:30:50.230: I/dalvikvm(3281):   at java.lang.reflect.Method.invoke(Method.java:511)
    01-29 13:30:50.230: I/dalvikvm(3281):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    01-29 13:30:50.230: I/dalvikvm(3281):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    01-29 13:30:50.230: I/dalvikvm(3281):   at dalvik.system.NativeStart.main(Native Method)
    01-29 13:30:50.270: I/Process(570): Sending signal. PID: 3281 SIG: 3
    01-29 13:30:50.270: I/dalvikvm(3281): threadid=3: reacting to signal 3
    01-29 13:30:50.310: W/WallpaperManager(3281): Can't generate default bitmap
    01-29 13:30:50.310: W/WallpaperManager(3281): java.lang.OutOfMemoryError
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.graphics.Bitmap.nativeCreate(Native Method)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.graphics.Bitmap.createBitmap(Bitmap.java:585)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.WallpaperManager.generateBitmap(WallpaperManager.java:729)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.WallpaperManager$Globals.getCurrentWallpaperLocked(WallpaperManager.java:265)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.WallpaperManager$Globals.peekWallpaperBitmap(WallpaperManager.java:230)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.WallpaperManager.getDrawable(WallpaperManager.java:350)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at storeapps.com.profilechanger.ListActivity.onCreate(ListActivity.java:64)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.Activity.performCreate(Activity.java:4466)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.ActivityThread.access$600(ActivityThread.java:123)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.os.Handler.dispatchMessage(Handler.java:99)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.os.Looper.loop(Looper.java:137)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at android.app.ActivityThread.main(ActivityThread.java:4424)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at java.lang.reflect.Method.invokeNative(Native Method)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at java.lang.reflect.Method.invoke(Method.java:511)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    01-29 13:30:50.310: W/WallpaperManager(3281):   at dalvik.system.NativeStart.main(Native Method)
    01-29 13:30:50.310: D/ProfileChangerApp(3281):  wallpaper manager is :android.app.WallpaperManager@41085b88
    01-29 13:30:50.320: D/ProfileChangerApp(3281): image is not null
    01-29 13:30:50.320: I/dalvikvm(3281): Wrote stack traces to '/data/anr/traces.txt'
    01-29 13:30:50.340: D/AndroidRuntime(3281): Shutting down VM
    01-29 13:30:50.371: W/dalvikvm(3281): threadid=1: thread exiting with uncaught exception (group=0x409bf1f8)
    01-29 13:30:50.430: E/AndroidRuntime(3281): FATAL EXCEPTION: main
    01-29 13:30:50.430: E/AndroidRuntime(3281): java.lang.RuntimeException: Unable to start activity ComponentInfo{storeapps.com.profilechanger/storeapps.com.profilechanger.ListActivity}: java.lang.NullPointerException
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.os.Handler.dispatchMessage(Handler.java:99)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.os.Looper.loop(Looper.java:137)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.ActivityThread.main(ActivityThread.java:4424)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at java.lang.reflect.Method.invokeNative(Native Method)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at java.lang.reflect.Method.invoke(Method.java:511)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at dalvik.system.NativeStart.main(Native Method)
    01-29 13:30:50.430: E/AndroidRuntime(3281): Caused by: java.lang.NullPointerException
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at storeapps.com.profilechanger.ListActivity.onCreate(ListActivity.java:70)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.Activity.performCreate(Activity.java:4466)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
    01-29 13:30:50.430: E/AndroidRuntime(3281):     ... 11 more

请帮帮我!

Answer 1

调整图像位图

Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.yourImageName);

上一行将从Drawable 获取Bitmap。除了添加上述行以从 Drawable 获取 Bitmap 之外，无需执行任何操作。

int height = (bitmap.getHeight() * 512 / bitmap.getWidth());
Bitmap scale = Bitmap.createScaledBitmap(bitmap, 512, height, true);
imageView.setImageBitmap(scale);