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在我的应用程序中，您点击一个启动图库的按钮。您选择一个图像，然后将该图像裁剪成一个正方形 (1:1)。根据该裁剪的结果，它会保存图像并将 uri 推送到新意图，该意图在 ImageView 中显示图像（非常简单）。不过，它大约有 30% 的时间有效，而且我在崩溃中找不到任何相似之处。似乎在我将它加载到我的设备上进行调试之后，它在我启动的前 2 次崩溃并在第 3 次运行。如果有人能帮助我理解这一点，我对此感到非常困惑，那就太好了！我的想法可能是 onResult 发生了很多事情，而我跳到另一个班级的意图在它完成其他任务之前就被解雇了。另外我是编码新手，所以请忍受我草率的代码。

日志猫：

09-10 11:12:55.291: E/AndroidRuntime(2608): FATAL EXCEPTION: main
09-10 11:12:55.291: E/AndroidRuntime(2608): java.lang.RuntimeException: Unable to resume activity {com.yourboytyler.shoutgram/com.yourboytyler.shoutgram.go}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=file:///mnt/sdcard/SHOUTgram/pic_1347297141912.jpg (has extras) }} to activity {com.yourboytyler.shoutgram/com.yourboytyler.shoutgram.go}: java.lang.NullPointerException
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.os.Looper.loop(Looper.java:130)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.main(ActivityThread.java:3691)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at java.lang.reflect.Method.invokeNative(Native Method)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at java.lang.reflect.Method.invoke(Method.java:507)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at dalvik.system.NativeStart.main(Native Method)
09-10 11:12:55.291: E/AndroidRuntime(2608): Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=file:///mnt/sdcard/SHOUTgram/pic_1347297141912.jpg (has extras) }} to activity {com.yourboytyler.shoutgram/com.yourboytyler.shoutgram.go}: java.lang.NullPointerException
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2111)
09-10 11:12:55.291: E/AndroidRuntime(2608):     ... 12 more
09-10 11:12:55.291: E/AndroidRuntime(2608): Caused by: java.lang.NullPointerException
09-10 11:12:55.291: E/AndroidRuntime(2608):     at com.yourboytyler.shoutgram.go.onActivityResult(go.java:163)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.Activity.dispatchActivityResult(Activity.java:3934)
09-10 11:12:55.291: E/AndroidRuntime(2608):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
09-10 11:12:55.291: E/AndroidRuntime(2608):     ... 13 more

代码：

 protected void onActivityResult(int requestCode,  
            int resultCode, Intent data) { 
            //Activity.RESULT_OK
            if (resultCode == -1) {  
                Toast.makeText(getApplicationContext(), mUri.getPath(), //THIS IS LINE 163
                          Toast.LENGTH_SHORT).show();
                b1.setEnabled(true);
                ImageView imgView=(ImageView)findViewById(R.id.i1);
                Uri imgUri=Uri.parse("file://" + mUri.getPath());
                imgView.setImageURI(imgUri);

                SharedPreferences.Editor editor = prefs.edit();
                editor.putString("uripic", mUri.toString());
                editor.commit();


                MediaScannerConnection.scanFile(this,
                        new String[] { goldburg.toString() }, null,
                        new MediaScannerConnection.OnScanCompletedListener() {
                    public void onScanCompleted(String path, Uri uri) {
                        Log.i("ExternalStorage", "Scanned " + path + ":");
                        Log.i("ExternalStorage", "-> uri=" + uri);
                    }
               });




                Intent openConnectPoint2 = new Intent("com.my.pakage.NAME"); //changed for privacy
                startActivity(openConnectPoint2);  
            }
            if (resultCode == Activity.RESULT_CANCELED) {  
            b1.setEnabled(true);
                return; 
             }



            if (requestCode == CAMERA_RESULT) {  
            Intent intent = new Intent(this, CropImage.class);  
            // here you have to pass absolute path to your file  
            intent.putExtra("image-path", mUri.getPath());  
            intent.putExtra("scale", true);  
            startActivity(intent);  
        }  



        }
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1 回答 1

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从评论中提出

LogCat 中最重要的信息是：

Caused by: java.lang.NullPointerException 
    at com.yourboytyler.shoutgram.go.onActivityResult(go.java:163)

你指出这是第 163 行：

Toast.makeText(getApplicationContext(), mUri.getPath(), Toast.LENGTH_SHORT).show();

我猜那mUri是null，但正如你所说，只是有时。当您尝试在 ..getPath()变量上调用方法时，会导致空指针异常null。所以仔细检查你设置的位置mUri = ...

于 2012-09-11T23:31:40.870 回答