牆紙管理器，getCropAndSetWallpaperIntent錯誤

我想使用getCropAndSetWallpaperIntent來裁剪和保存圖像作爲牆紙。但我收到錯誤「Utils中的getImageUri（位圖，上下文）無法應用於（位圖）」。牆紙管理器，getCropAndSetWallpaperIntent錯誤

下面是代碼

public void setAsWallpaper(Bitmap bitmap) { 

    WallpaperManager imageView = null; 
    bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap(); 
    WallpaperManager wm 
      = WallpaperManager.getInstance(_context); 

    try { 
     new Intent(wm.getCropAndSetWallpaperIntent(getImageUri(bitmap))); (**ERROR IS ON THIS LINE**) 
     Toast.makeText(_context, 
       _context.getString(R.string.toast_wallpaper_set), 
       Toast.LENGTH_SHORT).show(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
     Toast.makeText(_context, 
       _context.getString(R.string.toast_wallpaper_set_failed), 
       Toast.LENGTH_SHORT).show(); 
    } 
} 

private Uri getImageUri(Bitmap inImage, Context inContext) { 
    ByteArrayOutputStream bytes = new ByteArrayOutputStream(); 
    inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes); 
    String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), 
      inImage, "Title", null); 
    return Uri.parse(path); 
}

這是logcat的。

Process: com.example.wallpaper, PID: 25187 

java.lang.NullPointerException: Attempt to invoke virtual method 
'android.graphics.drawable.Drawable android.app.WallpaperManager.getDrawable()' on a null object reference 
                        at com.example.wallpaper.util.Utils.setAsWallpaper(Utils.java:90) 
                        at com.example.wallpaper.FullScreenViewActivity.onClick(FullScreenViewActivity.java:267) 
                        at android.view.View.performClick(View.java:5697) 
                        at android.view.View$PerformClick.run(View.java:22526) 
                        at android.os.Handler.handleCallback(Handler.java:739) 
                        at android.os.Handler.dispatchMessage(Handler.java:95) 
                        at android.os.Looper.loop(Looper.java:158) 
                        at android.app.ActivityThread.main(ActivityThread.java:7224) 
                        at java.lang.reflect.Method.invoke(Native Method) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

新的錯誤日誌

E/MediaStore: Failed to insert image 
                      java.lang.SecurityException: Permission Denial: writing com.android.providers.media.MediaProvider uri content://media/external/images/media from pid=11235, uid=10207 requires android.permission.WRITE_EXTERNAL_STORAGE, or grantUriPermission() 
                       at android.os.Parcel.readException(Parcel.java:1620) 
                       at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183) 
                       at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135) 
                       at android.content.ContentProviderProxy.insert(ContentProviderNative.java:476) 
                       at android.content.ContentResolver.insert(ContentResolver.java:1284) 
                       at android.provider.MediaStore$Images$Media.insertImage(MediaStore.java:986) 
                       at com.builditpossible.wallpaperpack.util.Utils.getImageUri(Utils.java:107) 
                       at com.builditpossible.wallpaperpack.util.Utils.setAsWallpaper(Utils.java:93) 
                       at com.builditpossible.wallpaperpack.FullScreenViewActivity.onClick(FullScreenViewActivity.java:259) 
                       at android.view.View.performClick(View.java:5697) 
                       at android.view.View$PerformClick.run(View.java:22526) 
                       at android.os.Handler.handleCallback(Handler.java:739) 
                       at android.os.Handler.dispatchMessage(Handler.java:95) 
                       at android.os.Looper.loop(Looper.java:158) 
                       at android.app.ActivityThread.main(ActivityThread.java:7224) 
                       at java.lang.reflect.Method.invoke(Native Method) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

設置壁紙並下載按鈕

@Override 
public void onClick(View v) { 
    Bitmap bitmap = ((BitmapDrawable) fullImageView.getDrawable()) 
      .getBitmap(); 
    switch (v.getId()) { 
    // button Download Wallpaper tapped 
    case R.id.llDownloadWallpaper: 
     utils.saveImageToSDCard(bitmap); 
     break; 
    // button Set As Wallpaper tapped 
    case R.id.llSetWallpaper: 
     utils.setAsWallpaper(bitmap); 
     break; 
    default: 
     break; 
    }

來源

2017-05-12 Ganesh

NullPointerException發生，因爲你的imageView變量是空和你在它試圖調用getDrawable()。

WallpaperManager imageView = null; 
bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();

低於線

new Intent(wm.getCropAndSetWallpaperIntent(getImageUri(bitmap))); (**ERROR IS ON THIS LINE**)

也改變

new Intent(wm.getCropAndSetWallpaperIntent(getImageUri(bitmap,_context)));

更新：

您可以通過下面的代碼獲得牆紙Drawable，並將其保存到SD卡。

final WallpaperManager wallpaperManager = WallpaperManager.getInstance(this); 
final Drawable wallpaperDrawable = wallpaperManager.getDrawable();

來源

2017-05-12 09:31:54

你能爲我編輯一下嗎？我對android不友好。 – Ganesh

我認爲你不需要上面兩行。因爲你已經在函數參數中傳入了'bitmap'。所以，刪除這兩行並檢查。 –

我已經刪除它們，但「新意圖（wm.getCropAndSetWallpaperIntent（getImageUri（bitmap）））;」仍然顯示錯誤（錯誤位於行尾的括號內的位圖上）。它要求我創建getImageUri方法，即使我擁有它。 – Ganesh

牆紙管理器，getCropAndSetWallpaperIntent錯誤

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