[英]Setting Drawable to imageView
我目前正在尝试检索程序包的图标,并使用此代码将其设置为imageView。 ai是一个Drawable。
final PackageManager pm = getPackageManager();
try {
ai = pm.getApplicationIcon(packageName);
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Bitmap bitmap = ((BitmapDrawable)ai).getBitmap();
Log.i("Icons Drawable", ai.toString());
Log.i("Icons Bitmap", bitmap.toString());
imageView.setImageBitmap(bitmap);
Logcat输出:
11-06 11:10:22.785: I/Icons Drawable(20017): android.graphics.drawable.BitmapDrawable@416184f0
11-06 11:10:22.785: I/Icons Bitmap(20017): android.graphics.Bitmap@41618488
11-06 11:10:22.790: E/AndroidRuntime(20017): FATAL EXCEPTION: main
11-06 11:10:22.790: E/AndroidRuntime(20017): java.lang.RuntimeException: Unable to start activity : java.lang.NullPointerException
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1973)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1999)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.ActivityThread.access$600(ActivityThread.java:127)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.os.Handler.dispatchMessage(Handler.java:99)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.os.Looper.loop(Looper.java:137)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.ActivityThread.main(ActivityThread.java:4513)
11-06 11:10:22.790: E/AndroidRuntime(20017): at java.lang.reflect.Method.invokeNative(Native Method)
11-06 11:10:22.790: E/AndroidRuntime(20017): at java.lang.reflect.Method.invoke(Method.java:511)
11-06 11:10:22.790: E/AndroidRuntime(20017): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:974)
11-06 11:10:22.790: E/AndroidRuntime(20017): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:741)
11-06 11:10:22.790: E/AndroidRuntime(20017): at dalvik.system.NativeStart.main(Native Method)
11-06 11:10:22.790: E/AndroidRuntime(20017): Caused by: java.lang.NullPointerException
11-06 11:10:22.790: E/AndroidRuntime(20017): at com.analyze.project.MalwareAlertDialog.onCreate(MalwareAlertDialog.java:98)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.Activity.performCreate(Activity.java:4465)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
11-06 11:10:22.790: E/AndroidRuntime(20017): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
11-06 11:10:22.790: E/AndroidRuntime(20017): ... 11 more
即使我尝试将Drawable直接设置为imageView也不起作用
imageView.setImageDrawable(ai);
尝试这个
PackageManager pm = getPackageManager();
ApplicationInfo info=pm.getApplicationInfo(packageName,PackageManager.GET_META_DATA);
imageView.setImageDrawable(info.loadIcon(pm));
我建议您使用输入流,这是一个示例
InputStream floorIs = context.getResources().openRawResource(R.drawable.floor_texture);
InputStream wallIs =context.getResources().openRawResource(R.drawable.wall_mayu_texture);
InputStream wallIs2 = context.getResources().openRawResource(R.drawable.wall_buzoo_texture);
InputStream wallIs3 = context.getResources().openRawResource(R.drawable.wall_niko_texture);
InputStream wallWindowIs =context.getResources().openRawResource(R.drawable.wall_window_texture);
InputStream ceilingIs = context.getResources().openRawResource(R.drawable.ceiling_texture);
Bitmap bitmaps[] = new Bitmap[6];
bitmaps[0] = null;
bitmaps[1] = null;
bitmaps[2] = null;
bitmaps[3] = null;
bitmaps[4] = null;
bitmaps[5] = null;
try{
bitmaps[0] = BitmapFactory.decodeStream(floorIs);
bitmaps[1] = BitmapFactory.decodeStream(wallIs);
bitmaps[2] = BitmapFactory.decodeStream(wallWindowIs);
bitmaps[3] = BitmapFactory.decodeStream(ceilingIs);
bitmaps[4] = BitmapFactory.decodeStream(wallIs2);
bitmaps[5] = BitmapFactory.decodeStream(wallIs3);
}
finally{
try{
floorIs.close();
floorIs = null;
wallIs.close();
wallIs = null;
wallIs2.close();
wallIs2 = null;
wallIs3.close();
wallIs3 = null;
wallWindowIs.close();
wallWindowIs = null;
ceilingIs.close();
ceilingIs = null;
}
catch(IOException e){}
}
之后,尝试将位图加载到您在使用之前定义的imageview
imageView.setImageBitmap(bitmap[0]);
这可能是一个幼稚的问题,但是由于这是在您的onCreate()回调中发生的,并且您为该ImageView获取了空指针异常,您是否忘记了调用setContentView来膨胀您的布局? 您的布局有可能从未创建过,这意味着您尝试绘制的View也不存在。
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