无法从 Android 中的图片库将图片设置为 imageview

Question

@Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != Activity.RESULT_CANCELED) {
      if (requestCode == PICK_IMAGE) {
        Uri selectedImageUri = data.getData();
        Log.d("PICK_IMAGE", selectedImageUri.toString());
        Dialog settingsDialog = new Dialog(this);
        settingsDialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        settingsDialog.setContentView(getLayoutInflater().inflate(R.layout.custom_dailogue, null));
        img_in_dailogue = (ImageView) findViewById(R.id.img_in_dailogue);
        ImageView img_in_dailogue = new ImageView(this);
        LinearLayout.LayoutParams vp = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
        img_in_dailogue.setLayoutParams(vp);
        img_in_dailogue.setMaxHeight(250);
        img_in_dailogue.setMaxWidth(350);
        img_in_dailogue.setImageURI(Uri.parse(selectedImageUri.toString()));
        settingsDialog.show();
      }
    }
  }

Logcat 错误

• java.lang.RuntimeException: 传递结果失败 ResultInfo{who=null, request=0, result=-1, data=Intent { dat=content://media/external/images/media/232 flg=0x1 } } 到活动 {com.leadconcept.whopopsup/com.leadconcept.whopopsup.CameraActivity}：java.lang.NullPointerException
• 在 com.leadconcept.whopopsup.CameraActivity.onActivityResult(CameraActivity.java:131)

第二个 logcat 错误将我带到这行代码：

img_in_dailogue.setImageURI(Uri.parse(selectedImageUri.toString()));

该代码有什么问题？我不明白为什么我不能将 imageUri 发送到 imageview。我还验证了我传递给 setImageURI 函数的 Uri 值是正确的。

Answer 1

img_in_dailogue = (ImageView) findViewById(R.id.img_in_dailogue);
ImageView img_in_dailogue = new ImageView(this);

在初始化之前你不是在使用img_in_dailogue（顺便说一句，它是“对话”，不是对话）吗？不应该是：

ImageView img_in_dailogue = new ImageView(this);
img_in_dailogue = (ImageView) findViewById(R.id.img_in_dailogue);

HTH。