我正在嘗試創建一個應用程序,我可以讓用戶選擇要在其個人資料中顯示的圖片.我可以在imageview上瀏覽和設置他們選擇的圖像.但是一旦活動被破壞,圖像就會丟失.我試圖實現onSaveInstanceState,但它仍然是相同的.我想知道我是否正確使用它.我希望你能幫助像我這樣的新手.提前致謝.這是我正在使用的代碼：

public class AccountFragment extends Fragment implements OnClickListener {

private LoginDataBaseAdapter loginDataBaseAdapter;

Bitmap image;

Bitmap bitmap;

String picture_location;

TextView textTargetUri;

ImageView targetImage;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View rootView = inflater.inflate(R.layout.fragment_account, container, false);

textTargetUri = (TextView) rootView.findViewById(R.id.targeturi);

targetImage=(ImageView) rootView.findViewById(R.id.profpic);

targetImage.setOnClickListener(new ImageView.OnClickListener(){

@Override

public void onClick(View arg0) {

Intent intent = new Intent(Intent.ACTION_PICK,

android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

startActivityForResult(intent, 0);

}});

if (savedInstanceState != null) {

//if there is a bundle, use the saved image resource (if one is there)

image = savedInstanceState.getParcelable("BitmapImage");

targetImage.setImageBitmap(image);

textTargetUri.setText(savedInstanceState.getString("path_to_picture"));

}

return rootView;

}

@Override

public void onSaveInstanceState(Bundle savedInstanceState){

super.onSaveInstanceState(savedInstanceState);

savedInstanceState.putParcelable("BitmapImage", bitmap);

savedInstanceState.putString("path_to_picture", picture_location);

}

@Override

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

super.onActivityResult(requestCode, resultCode, data);

if (resultCode == Activity.RESULT_OK){

Uri targetUri = data.getData();

picture_location = targetUri.toString();

textTargetUri.setText(targetUri.toString());

Bitmap bitmap;

try {

bitmap = BitmapFactory.decodeStream(getActivity().getContentResolver().openInputStream(targetUri));

targetImage.setImageBitmap(bitmap);

}

catch (FileNotFoundException e){

e.printStackTrace();

}

}

}

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

}}

順便說一句,你可能已經注意到,在oncreate之后我沒有使用onRestoreInstanceState,而是嘗試使用不同的方法.我從另一個問題中找到了答案,你也可以在oncreate中實現它.我使用它,因為每當我聲明函數onRestoreInstanceState時,我都會被要求刪除@Override注釋.

@Override

protected void onRestoreInstanceState(Bundle savedInstanceState){

image = savedInstanceState.getParcelable("BitmapImage");

targetImage.setImageBitmap(image);

textTargetUri.setText(savedInstanceState.getString("path_to_picture"));

}

總結

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