大佬教程收集整理的这篇文章主要介绍了android – 无法通过4.2.2 AVD上的意图选择器从相机获取图像，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
它在我的2.2.1安卓手机上工作正常,但是当我在4.2.2 AVD上编译它时,当我使用相机时它会返回空指针错误,
public void onClick(View view) { Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT,null); galleryIntent.setType("image/*"); galleryIntent.setAction(Intent.ACTION_GET_CONTENT); galleryIntent.addCategory(Intent.CATEGORY_OPENABLE); Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); Intent chooser = new Intent(Intent.ACTION_CHOOSER); chooser.putExtra(Intent.EXTRA_INTENT,galleryIntent); chooser.putExtra(Intent.EXTRA_titlE,"Chooser"); Intent[] intentArray = {CameraIntent}; chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS,intentArray); startActivityForResult(chooser,requEST_CODE); } protected void onActivityResult(int requestCode,int resultCode,Intent data) { if (requestCode == requEST_CODE && resultCode == Activity.RESULT_OK) { try { if (bitmap != null) { bitmap.recycle(); } InputStream stream = getContentResolver().openInputStream(data.getData()); bitmap = BitmapFactory.decodeStream(stream); stream.close(); imageView.setImageBitmap(bitmap); } catch (FileNotFoundException E) { e.printStackTrace(); } catch (IOException E) { e.printStackTrace(); } super.onActivityResult(requestCode,resultCode,data); } }
这是我得到的错误：
05-05 05：03：31.730：E / AndroidRuntime(820)：引起：java.lang.NullPointerException
并且它说问题在于这一行：
InputStream stream = getContentResolver().openInputStream(data.getData());
我究竟做错了什么？
更新：
现在它正在运行,这是解决方案：
protected void onActivityResult(int requestCode,Intent data) { if (requestCode == requEST_CODE && resultCode == Activity.RESULT_OK) { if(data.getData()!=null) { try { if (bitmap != null) { bitmap.recycle(); } InputStream stream = getContentResolver().openInputStream(data.getData()); bitmap = BitmapFactory.decodeStream(stream); stream.close(); imageView.setImageBitmap(bitmap); } catch (FileNotFoundException E) { e.printStackTrace(); } catch (IOException E) { e.printStackTrace(); } } else { bitmap=(Bitmap) data.getExtras().get("data"); imageView.setImageBitmap(bitmap); } super.onActivityResult(requestCode,data); } }
谢谢你的帮助！
以下代码用于相机按钮点击工作：
imgviewCamera.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub //define the file-name to save photo taken by Camera activity String filename = "new-photo-name.jpg"; //create parameters for Intent with filename ContentValues values = new ContentValues(); values.put(MediaStore.Images.Media.titlE,fileName); values.put(MediaStore.Images.Media.DESCRIPTION,"Image capture by camera"); //imageUri is the current activity attribute,define and save it for later usage (also in onSaveInstanceStatE) imageUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values); //create new Intent Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri); intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY,1); startActivityForResult(intent,PICK_Camera_IMAGE); } }); OnActivityresult code will be like below protected void onActivityResult(int requestCode,Intent data) { Uri SELEctedImageUri = null; String filePath = null; switch (requestCodE) { case PICK_Camera_IMAGE: if (resultCode == RESULT_OK) { //use imageUri here to access the image SELEctedImageUri = imageUri; } else if (resultCode == RESULT_CANCELED) { Toast.makeText(this,"Picture was not taken",Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this,Toast.LENGTH_SHORT).show(); } break; } if(SELEctedImageUri != null){ try { // OI FILE Manager String filemanagerString = SELEctedImageUri.getPath(); // MEDIA GALLERY String SELEctedImagePath = getPath(SELEctedImageUri); if (SELEctedImagePath != null) { filePath = SELEctedImagePath; } else if (filemanagerString != null) { filePath = filemanagerString; } else { Toast.makeText(getApplicationContext(),"UnkNown path",Toast.LENGTH_LONG).show(); Log.e("Bitmap","UnkNown path"); } if (filePath != null) { Toast.makeText(getApplicationContext()," path" + filePath,Toast.LENGTH_LONG).show(); Intent i = new Intent(getApplicationContext(),EditOractivity.class); // passing array index i.putExtra("id",filePath); startActivity(i); } } catch (Exception E) { Toast.makeText(getApplicationContext(),"Internal error",Toast.LENGTH_LONG).show(); Log.e(e.getClass().getName(),e.getmessage(),E); } } } public String getPath(Uri uri) { String[] projection = { MediaStore.Images.Media.DATA }; cursor cursor = managedQuery(uri,projection,null,null); if (cursor != null) { // HERE you wILL GET A NULLPOINTER IF cursOR IS NULL // THIS CAN BE,IF YOU USED OI FILE MANAGER FOR PICKING THE MEDIA int column_index = cursor .getcolumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_indeX); } else return null; }
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