Question

我正在尝试启动相机活动，然后在用户保存并返回应用时捕获照片。这在运行Android 2.2的手机上工作正常但我在运行4.1.2的平板电脑上遇到了NullPointerException。

当我尝试从传递的'数据'中创建一个位图时，我看到应用程序在'onActivityResult'中获得了NullPointerException（显然没有数据传递）：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    pauseTime = System.currentTimeMillis();
    Log.i(TAG, "Camera result time pauseTime should be reset: " + pauseTime);
    Log.i(TAG, "Camera resultCode is equal to: " + resultCode + " RESULT_OK is: " + RESULT_OK);

    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {

        try {
            Bitmap photo = (Bitmap) data.getExtras().get("data");
        } catch (Exception e) {
            // Data is null getting sent back
            e.printStackTrace();
        }

logcat中的错误如下所示：

07-29 17:16:50.795: W/System.err(19517): java.lang.NullPointerException
07-29 17:16:50.795: W/System.err(19517):    at     com.android.thoughtfi.UsersThoughts.onActivityResult(UsersThoughts.java:163)
07-29 17:16:50.795: W/System.err(19517):    at android.app.Activity.dispatchActivityResult(Activity.java:5391)
07-29 17:16:50.795: W/System.err(19517):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3215)
07-29 17:16:50.795: W/System.err(19517):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3262)
07-29 17:16:50.795: W/System.err(19517):    at android.app.ActivityThread.access$1200(ActivityThread.java:140)
07-29 17:16:50.795: W/System.err(19517):    at     android.app.ActivityThread$H.handleMessage(ActivityThread.java:1286)
07-29 17:16:50.800: W/System.err(19517):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-29 17:16:50.800: W/System.err(19517):    at android.os.Looper.loop(Looper.java:137)
07-29 17:16:50.800: W/System.err(19517):    at android.app.ActivityThread.main(ActivityThread.java:4947)
07-29 17:16:50.800: W/System.err(19517):    at java.lang.reflect.Method.invokeNative(Native Method)

为什么没有任何数据返回到应用程序的onactivityresult？

编辑（有关额外信息，这里是photoButton）：

    photoButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // possible option
            String fileName = "temp.jpg";
            ContentValues values = new ContentValues();
            values.put(MediaStore.Images.Media.TITLE, fileName);
            mCapturedImageURI = getContentResolver().insert(
                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
            startActivityForResult(intent, CAMERA_REQUEST);
        }
    });

编辑这似乎工作正常，但无论我如何将它放在平板电脑上，我仍然会以横向模式显示照片：

onActivityResult：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    pauseTime = System.currentTimeMillis();
    Log.i(TAG, "Camera result time pauseTime should be reset: " + pauseTime);
    Log.i(TAG, "Camera resultCode is equal to: " + resultCode + " ");

    Log.i(TAG, "The intent mCapturedImageURI was: " + mCapturedImageURI);

    Bitmap photo = null;
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
        if(data != null){
            photo = (Bitmap) data.getExtras().get("data");
        } else {
                try {
                    photo = MediaStore.Images.Media.getBitmap(this.getContentResolver(), mCapturedImageURI);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }               
        }

        imageView.setImageBitmap(photo);
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(mCapturedImageURI, projection, null,
                null, null);
        int column_index_data = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        capturedImageFilePath = cursor.getString(column_index_data);

Photo BUtton：

photoButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // possible option
            String fileName = "temp.jpg";
            ContentValues values = new ContentValues();
            values.put(MediaStore.Images.Media.TITLE, fileName);
            mCapturedImageURI = getContentResolver().insert(
                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
            startActivityForResult(intent, CAMERA_REQUEST);
        }
    });

Answer 1

在相机的reference page上，doc说明它返回包含捕获图片的文件的路径。

在平板电脑上使用应用程序时无法显示图像

1 个答案: