将图片保存在指定的文件夹中

Question

       Btngetdata.setOnClickListener(new OnClickListener(){
        public void onClick(View v){
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, 2);
        }
    });
public void onActivityResult(int requestCode, int resultCode, Intent data) {
        File a = new File (Environment.getExternalStorageDirectory().getAbsolutePath() + "/splash/"+name+"/");
        if (!a.exists()) {
            a.mkdirs();
        }
        if (requestCode == 2) {
            Bitmap photo = (Bitmap) data.getExtras().get("data");
            ImageView test = (ImageView) findViewById(R.id.test);
            test.setImageBitmap(photo);
            try{
                SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
                String currentDateandTime = sdf.format(new Date()).replace(" ","");
                FileOutputStream out = new FileOutputStream(Environment.getExternalStorageDirectory().getAbsolutePath() + "/splash/"+name+"/"+currentDateandTime+".jpg");
                photo.compress(Bitmap.CompressFormat.PNG, 100 , out);

                out.flush();
                out.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

       Btngetdata.setOnClickListener(new OnClickListener(){
        public void onClick(View v){
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            f = new File(Environment.getExternalStorageDirectory().getPath() + "/tmp/"+"tmp.png");
            if (!f.exists()) {
                f.mkdirs();
            }
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
            startActivityForResult(cameraIntent, 2);
        }
    });

04-17 20:41:24.974: E/AndroidRuntime(13913): FATAL EXCEPTION: main
04-17 20:41:24.974: E/AndroidRuntime(13913): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=2, result=0, data=null} to activity {com.example.sofrehkhane/com.sofrehKhane.slidingmenu.slidinglist.SingleItemView}: java.lang.NullPointerException
04-17 20:41:24.974: E/AndroidRuntime(13913):    at     android.app.ActivityThread.deliverResults(ActivityThread.java:3462)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3505)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.app.ActivityThread.access$1100(ActivityThread.java:150)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1346)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.os.Looper.loop(Looper.java:213)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.app.ActivityThread.main(ActivityThread.java:5225)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at java.lang.reflect.Method.invokeNative(Native Method)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at java.lang.reflect.Method.invoke(Method.java:525)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at dalvik.system.NativeStart.main(Native Method)
04-17 20:41:24.974: E/AndroidRuntime(13913): Caused by: java.lang.NullPointerException
04-17 20:41:24.974: E/AndroidRuntime(13913):    at com.sofrehKhane.slidingmenu.slidinglist.SingleItemView.onActivityResult(SingleItemView.java:102)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.app.Activity.dispatchActivityResult(Activity.java:5322)
04-17 20:41:24.974: E/AndroidRuntime(13913):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3458)
04-17 20:41:24.974: E/AndroidRuntime(13913):    ... 11 more

更新：通过使用这个链接，我得到了我的应用程序的最佳答案和性能。

Answer 1

在队伍中

Bitmap photo = (Bitmap) data.getExtras().get("data");

根据StackTrace,数据为空。您必须检查那里是否有null并相应地执行操作。

此外，请检查以下答案:https://stackoverflow.com/A/10779050/2367849