Android 从图库中获取图像到 ImageView

Android get image from gallery into ImageView(Android 从图库中获取图像到 ImageView)

问题描述

我正在尝试将照片从画廊添加到 ImageView 但我收到此错误:

I'm trying to add a photo from galery to a ImageView but I get this error:

java.lang.RuntimeException: 传递结果失败ResultInfo{who=null, request=1, result=-1, data=Intent {dat=content://media/external/images/media/1 }} 到活动{hotMetter.pack/hotMetter.pack.GetPhoto}:java.lang.NullPointerException

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/1 }} to activity {hotMetter.pack/hotMetter.pack.GetPhoto}: java.lang.NullPointerException

这是我的代码:

      Intent intent = new Intent();
      intent.setType("image/*");
      intent.setAction(Intent.ACTION_GET_CONTENT);

      startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE);
}
Bitmap bitmap=null;
public void onActivityResult(int requestCode, int resultCode, Intent data)
{

    if (resultCode == Activity.RESULT_OK)
    {
        if (requestCode == SELECT_PICTURE) 
        {
             Uri selectedImageUri = data.getData();           
             selectedImagePath = getPath(selectedImageUri);             
             tv.setText(selectedImagePath);
             img.setImageURI(selectedImageUri); 
         }
    }


 public String getPath(Uri uri) 
    {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if (cursor == null) return null;
        int column_index =             cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        String s=cursor.getString(column_index);
        cursor.close();
        return s;
    }

我得到 selectedImagePath="mnt/sdcard/DCIM/myimage" 但在 img.setImageURI(selectedImageUri); 我得到错误.

I get the selectedImagePath="mnt/sdcard/DCIM/myimage" but on img.setImageURI(selectedImageUri); i get the error.

我也使用了 Bitmap 并尝试从 SetImageBitmap 设置图像，但我得到了同样的错误.

I've also used a Bitmap and tried to set the image from SetImageBitmap but i get the same error.

LogCat:

05-06 19:41:34.191: E/AndroidRuntime(8466): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/1 }} to activity {hotMetter.pack/hotMetter.pack.GetPhoto}: java.lang.NullPointerException
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:2574)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.access$2000(ActivityThread.java:117)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:961)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.os.Looper.loop(Looper.java:123)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.main(ActivityThread.java:3683)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at java.lang.reflect.Method.invokeNative(Native Method)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at java.lang.reflect.Method.invoke(Method.java:507)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at dalvik.system.NativeStart.main(Native Method)
05-06 19:41:34.191: E/AndroidRuntime(8466): Caused by: java.lang.NullPointerException
05-06 19:41:34.191: E/AndroidRuntime(8466):     at hotMetter.pack.GetPhoto.onActivityResult(GetPhoto.java:55)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.Activity.dispatchActivityResult(Activity.java:3908)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2528)

请提供建议.谢谢！

推荐答案

在调试模式下运行应用程序并在 if (requestCode == SELECT_PICTURE) 上设置断点，并在逐步执行时检查每个变量以确保它按预期设置.如果您在 img.setImageURI(selectedImageUri); 上获得 NPE，则未设置 img 或 selectedImageUri.

Run the app in debug mode and set a breakpoint on if (requestCode == SELECT_PICTURE) and inspect each variable as you step through to ensure it is being set as expected. If you are getting a NPE on img.setImageURI(selectedImageUri); then either img or selectedImageUri are not set.

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