java将相册艺术显示到图像视图中
我想将相册艺术加载到图像视图中,但我的代码不工作,并给出错误,如何解决我的错误?请帮忙
ImageView imageView= (ImageView) findViewById(R.id.imageView);
Uri sArtworkUri = Uri.parse("/sdcard/Sqlit/AndroidDownloadManager.mp3");
if (sArtworkUri !=null){
MediaMetadataRetriever mData=new MediaMetadataRetriever();
mData.setDataSource(this,sArtworkUri);
byte art[]=mData.getEmbeddedPicture();
Bitmap image= BitmapFactory.decodeByteArray(art,0,art.length);
imageView.setImageBitmap(image);
}
错误
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.andriodtime.net/com.andriodtime.net.MainActivity}: java.lang.NullPointerException
at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at 安卓.app.ActivityThread.access$800(ActivityThread.java:135)
at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at 安卓.os.Handler.dispatchMessage(Handler.java:102)
at 安卓.os.Looper.loop(Looper.java:136)
at 安卓.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.andriodtime.net.MainActivity.initView(MainActivity.java:91)
at com.andriodtime.net.MainActivity.onCreate(MainActivity.java:35)
# 1 楼答案
您的应用程序可能没有从SD卡读取的权限
您可以将以下权限添加到清单中
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
https://developer.android.com/reference/android/Manifest.permission.html#READ_EXTERNAL_STORAGE
请注意,您可能必须在运行时请求此权限