Question

这是我目前的代码：

public void onClick(View v) {


                final Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);
                final Intent gallIntent=new Intent(Intent.ACTION_GET_CONTENT);
                gallIntent.setType("image/*"); 
                final Intent camIntent = new Intent("android.media.action.IMAGE_CAPTURE");
                pickIntent.putExtra(Intent.EXTRA_INTENT, camIntent);
                pickIntent.putExtra(Intent.EXTRA_INTENT, gallIntent);
                pickIntent.putExtra(Intent.EXTRA_TITLE, "Select Source");

                startActivityForResult(pickIntent, 0);
                if (bitmap == null) {
                    Toast.makeText(getApplicationContext(),
                            "Please select image", Toast.LENGTH_SHORT).show();
                } else {
                    dialog = ProgressDialog.show(CreatePod.this, "Uploading",
                            "Please wait...", true);
                    //new ImageUploadTask().execute();
                }
            }
        });

    }



    protected  void onActivityResult(int requestCode, int resultCode, Intent data){


     super.onActivityResult(requestCode, resultCode, data);


     if (resultCode == RESULT_CANCELED) {
         Toast toast = Toast.makeText(this,"camera cancelled", 10000);
         toast.show();
         return;
         }

        // lets check if we are really dealing with a picture

         if (requestCode == 0 && resultCode == RESULT_OK)
         {

             Bundle extras = data.getExtras();
                Bitmap b = (Bitmap) extras.get("data");
                //setContentView(R.layout.main);


                imgView.setImageBitmap(b);
           // save image to gallery
             String timestamp = Long.toString(System.currentTimeMillis());
             MediaStore.Images.Media.insertImage(getContentResolver(), b, timestamp, timestamp);

         }

    }

这给出了Gallery和Camera选项（实际上，它显示了一个不支持的设备代替相机。如果我点击它，它会给出NullPointerException并崩溃。这是正确的方法吗？或者我应该使用PackageManger ？如果是，那怎么做？

Answer 1

查看您的代码，我认为您缺乏基本的Android知识，

错过使用onActivityResult()，它是Activity类的一种方法，从onClick（）中取出它

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{

}

只需检查基本的Android活动方法以及如何使用它们。

更新

查看Android-Activity

在Android中从相机上传图像时出现空指针异常

1 个答案: