这是我的代码来自here
public class CatFragment extends Fragment implements OnClickListener{
private DBCreater dbCreate;
private static final int SELECT_PICTURE = 1;
private String selectedImagePath = "android.resource://com.example.abcd/" + R.drawable.pets;
private ImageView img;
//private Button imgBtn;
private Uri mCropImagedUri;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View gv = inflater.inflate(R.layout.new_pet, null);
Spinner sp = (Spinner) gv.findViewById(R.id.ETPetType);
// get reference
sp.setAdapter(new ArrayAdapter<String>(getActivity().getBaseContext(), android.R.layout.simple_spinner_dropdown_item, petType));
Button btnSubmit = (Button) gv.findViewById(R.id.ButtonNext);
btnSubmit.setOnClickListener(this);
img = (ImageView)gv.findViewById(R.id.ImageView01);
((Button) gv.findViewById(R.id.ETPetImg))
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
try {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 0);
intent.putExtra("aspectY", 0);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 200);
intent.putExtra("return-data", false);
File f = createNewFile("CROP_");
try {
f.createNewFile();
} catch (IOException ex) {
Log.e("io", ex.getMessage());
}
mCropImagedUri = Uri.fromFile(f);
intent.putExtra(MediaStore.EXTRA_OUTPUT,
mCropImagedUri);
// start the activity - we handle returning in
// onActivityResult
startActivityForResult(intent, SELECT_PICTURE);
} catch (ActivityNotFoundException anfe) {
// display an error message
}
}
});
return gv;
}
private File createNewFile(String prefix){
if(prefix==null || "".equalsIgnoreCase(prefix)){
prefix="IMG_";
}
File newDirectory = new File(Environment.getExternalStorageDirectory()+"/Android/data/com.example.abcd/files/");
if(!newDirectory.exists()){
if(newDirectory.mkdir()){
Log.d(this.getClass().getName(), newDirectory.getAbsolutePath()+" directory created");
}
}
File file = new File(newDirectory,(prefix+System.currentTimeMillis()+".jpg"));
if(file.exists()){
//this wont be executed
file.delete();
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
return file;
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri); //To get image path
System.out.println("Image Path : " + selectedImagePath);
img.setImageURI(selectedImageUri);
}
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
//Cursor cursor = managedQuery(uri, projection, null, null, null);
Cursor cursor = getActivity().getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//access the database
dbCreate = new DBCreater(getActivity());
}
@Override
public void onClick(View v) {
displayNextAlert();
}
通过使用此代码，我可以裁剪图像，但它没有保存并返回Toast消息统计信息无法保存裁剪的图像。我在LogCat中看不到任何其他错误。请有人帮忙吗？提前谢谢。
logcat的：
11-15 07:15:38.215: E/AndroidRuntime(27214): FATAL EXCEPTION: main
11-15 07:15:38.215: E/AndroidRuntime(27214): java.lang.RuntimeException: Unable to resume activity {com.example.abcd/com.example.abcd.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=1, result=-1, data=Intent { (has extras) }} to activity {com.example.abcd/com.example.abcd.MainActivity}: java.lang.NullPointerException
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2919)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2948)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2354)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.access$700(ActivityThread.java:159)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.os.Looper.loop(Looper.java:176)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.main(ActivityThread.java:5419)
11-15 07:15:38.215: E/AndroidRuntime(27214): at java.lang.reflect.Method.invokeNative(Native Method)
11-15 07:15:38.215: E/AndroidRuntime(27214): at java.lang.reflect.Method.invoke(Method.java:525)
11-15 07:15:38.215: E/AndroidRuntime(27214): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
11-15 07:15:38.215: E/AndroidRuntime(27214): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
11-15 07:15:38.215: E/AndroidRuntime(27214): at dalvik.system.NativeStart.main(Native Method)
11-15 07:15:38.215: E/AndroidRuntime(27214): Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=1, result=-1, data=Intent { (has extras) }} to activity {com.example.abcd/com.example.abcd.MainActivity}: java.lang.NullPointerException
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.deliverResults(ActivityThread.java:3500)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2906)
11-15 07:15:38.215: E/AndroidRuntime(27214): ... 12 more
11-15 07:15:38.215: E/AndroidRuntime(27214): Caused by: java.lang.NullPointerException
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1147)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.content.ContentResolver.query(ContentResolver.java:401)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.content.ContentResolver.query(ContentResolver.java:360)
11-15 07:15:38.215: E/AndroidRuntime(27214): at com.example.abcd.NewPetsFragment.getPath(NewPetsFragment.java:155)
11-15 07:15:38.215: E/AndroidRuntime(27214): at com.example.abcd.NewPetsFragment.onActivityResult(NewPetsFragment.java:143)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.Activity.dispatchActivityResult(Activity.java:5567)
11-15 07:15:38.215: E/AndroidRuntime(27214): at android.app.ActivityThread.deliverResults(ActivityThread.java:3496)
11-15 07:15:38.215: E/AndroidRuntime(27214): ... 13 more
答案 0 :(得分：1)
我通过更改保存的目录路径来使代码工作，如下所示：
File newDirectory = new File(Environment.getExternalStorageDirectory()+"/test/");
原因：我无法保存到写保护目录＆＃34; /Android/data/com.example.abcd/files /"
并通过对onActivityResult进行更改：
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
// Uri selectedImageUri = data.getData();
// selectedImagePath = getPath(selectedImageUri); //To get image path
selectedImagePath = mCropImagedUri.getPath(); //To get image path
System.out.println("Image Path : " + selectedImagePath);
// img.setImageURI(selectedImageUri);
}
}
}
注意：您可能不需要注释掉img.setImageURI行。我不得不进行测试。
确保您已在AndroidManifest中添加了写入权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />