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我有開發的應用程序，從SDcard獲取所有類型（圖像，音頻，視頻）的路徑... 它可以正常打開默認Android瀏覽器（庫）。但是當我在其他應用程序中打開SD卡時，它會拋出NullPointer。例如，我已通過我的應用程序打開SDcard，使用Explorer應用程序顯示空指針異常... 我將保存圖像路徑到SQlite，並從SQLite獲取其他活動的內容。但是這個資源管理器應用程序顯示所有類型，不僅僅是指定的類（例如我選擇圖像按鈕，但它顯示所有類型）。如何從android中的SDcard獲取路徑爲音頻，視頻，圖像，文件？
radio_group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup rd_group, int checked_id) {
checking = null;
switch(checked_id) {
case R.id.radio_image:
checking = "image";
break;
case R.id.radio_audio:
checking = "audio";
break;
case R.id.radio_video:
checking = "video";
break;
}
}
});
// I have a radio button for type of content will shown only
select_content.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if(checking.equals("")) {
Toast.makeText(getApplicationContext(), "Please select the content type", Toast.LENGTH_SHORT).show();
return;
}
// when i select image, show image content only in SDcard.
// When i select audio, show only audio contents.
// when i select video, show only video contents.
if(checking.equals("image")) {
Intent intent_image = new Intent();
intent_image.setType("image/*");
intent_image.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent_image, "Select Image"), SELECT_IMAGE_DIALOG);
}
if(checking.equals("audio")) {
Intent intent_audio = new Intent();
intent_audio.setType("audio/*");
intent_audio.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent_audio, "Select Audio"), SELECT_AUDIO_DIALOG);
}
if(checking.equals("video")) {
Intent intent_video = new Intent();
intent_video.setType("video/*");
intent_video.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent_video, "Select Video"), SELECT_VIDEO_DIALOG);
}
}
});
public void onActivityResult(int requestCode, int resultCode, Intent result) {
// imagePath = null;
if (requestCode == SELECT_IMAGE_DIALOG) {
if (resultCode == Activity.RESULT_OK) {
Uri data = result.getData();
Log.d("DATA", data.toString());
selected_Path = getPath(data);
final_path.getBytes();
selected_path_text.setText(final_path);
Log.d("Image Path", final_path);
}
}
if (requestCode == SELECT_AUDIO_DIALOG) {
if (resultCode == RESULT_OK) {
Uri data = result.getData();
Log.d("DATA", data.toString());
selected_Path = getPath(data);
final_path.getBytes();
selected_path_text.setText(final_path);
Log.d("Audio Path", final_path);
}
}
if (requestCode == SELECT_VIDEO_DIALOG) {
if (resultCode == RESULT_OK) {
Uri data = result.getData();
Log.d("DATA", data.toString());
selected_Path = getPath(data);
final_path.getBytes();
selected_path_text.setText(final_path);
Log.d("Video Path", final_path);
}
}
}
private String getPath(Uri data) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(data, projection, null, null, null);
column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
final_path = cursor.getString(column_index);
Log.d("Image Path", final_path);
return cursor.getString(column_index);
}
'應用程序從SD卡獲取路徑'。你的代碼中沒有任何東西與SD卡有關。請說明如何在另一個應用程序中打開您的SD卡。 – greenapps
'打開默認Android瀏覽器（圖庫）'。 Gallery應用程序不是瀏覽器，因此不是默認的Android瀏覽器。 – greenapps
整體而言：你的文字和你的代碼之間幾乎沒有關係。 – greenapps