从相机获取图像时，布局 getHeight() 和 getWidth() 返回 0

Question

当我从图库中获取图像时，我正在创建一个相框应用程序，但它工作正常，但是当我尝试从相机获取图像时，我的 framelayout.getwidth() 和 framelayout。 getHeight() 方法返回 0。

我的代码如下：

btnGetImage.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
            imagePickerDialog();
    }
});

public void imagePickerDialog() {
    AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this);
    myAlertDialog.setTitle("Pictures Option");
    myAlertDialog.setIcon(R.drawable.getimage_icon);
    myAlertDialog.setMessage("Select Picture From...");
    myAlertDialog.setPositiveButton("Gallery",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface arg0, int arg1) {
                Intent fileIntent = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(fileIntent,
                        Constant.FILE_REQUEST);
            }
        });
    myAlertDialog.setNegativeButton("Camera",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface arg0, int arg1) {
                Intent cameraIntent = new Intent(
                        android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(cameraIntent,
                        Constant.CAMERA_REQUEST);
            }
        });
    myAlertDialog.show();
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == Constant.CAMERA_REQUEST && resultCode == RESULT_OK) {
        Bitmap camera_image = (Bitmap) data.getExtras().get("data");
        addViewInFrame(camera_image);               
    } else if (requestCode == Constant.FILE_REQUEST
            && resultCode == RESULT_OK) {

        Uri selectedImage = data.getData();
        String[] filePath = { MediaStore.Images.Media.DATA };
        Cursor c = getContentResolver().query(selectedImage, filePath,
                null, null, null);
        c.moveToFirst();
        int columnIndex = c.getColumnIndex(filePath[0]);
        String picturePath = c.getString(columnIndex);
        c.close();
        addViewInFrame(getScaledBitmap(picturePath, 300, 300));
    }
}

public void addViewInFrame(Bitmap viewBit) {
    if (android.os.Build.VERSION.SDK_INT <= 10) {
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        int screenWidth = metrics.widthPixels;
        int screenHeight = metrics.heightPixels;

        imageBitmap = Bitmap.createScaledBitmap(viewBit, screenWidth,
            screenHeight / 2, true);
        image1 = new TouchImageView(getApplicationContext());
        image1.setScaleType(ScaleType.MATRIX);
        image1.setImageBitmap(imageBitmap);
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
            screenWidth, screenHeight / 2);
        params.leftMargin = 0;
        params.topMargin = 0;
        frame.addView(image1, params);
    else {
        imageBitmap = Bitmap.createScaledBitmap(viewBit,
            frame.getWidth(), frame.getHeight() / 2, true);
        image1 = new TouchImageView(getApplicationContext());
        image1.setScaleType(ScaleType.MATRIX);
        image1.setImageBitmap(imageBitmap);
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                frame.getWidth(), frame.getHeight() / 2);
        params.leftMargin = 0;
        params.topMargin = 0;
        frame.addView(image1, params);
}

这里的frame是我的framelayout。

错误日志是：

Process: com.example.imageoverotherimage, PID: 3065
java.lang.RuntimeException: Unable to resume activity 
{com.example.imageoverotherimage/com.example.imageoverotherimage.MainActivity}: 
java.lang.RuntimeException: Failure delivering result 
ResultInfo{who=null, request=1888, result=-1, data=Intent { 
act=inline-data dat=content://media/external/images/media/6658 (has extras) }} 
to activity {com.example.imageoverotherimage/com.example.imageoverotherimage.MainActivity}: 
java.lang.IllegalArgumentException: width and height must be > 0

    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2996)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3025)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3974)
    at android.app.ActivityThread.access$1000(ActivityThread.java:166)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1287)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5511)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
    at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.RuntimeException: Failure delivering result 
ResultInfo{who=null, request=1888, result=-1, data=Intent { 
act=inline-data dat=content://media/external/images/media/6658 (has extras) }} 
to activity {com.example.imageoverotherimage/com.example.imageoverotherimage.MainActivity}: 
java.lang.IllegalArgumentException: width and height must be > 0

    at android.app.ActivityThread.deliverResults(ActivityThread.java:3601)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2983)
    ... 13 more

Caused by: java.lang.IllegalArgumentException: width and height must be > 0
    at android.graphics.Bitmap.createBitmap(Bitmap.java:922)
    at android.graphics.Bitmap.createBitmap(Bitmap.java:901)
    at android.graphics.Bitmap.createBitmap(Bitmap.java:833)
    at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:709)
    at com.example.imageoverotherimage.MainActivity.addViewInFrame(MainActivity.java:232)
    at com.example.imageoverotherimage.MainActivity.onActivityResult(MainActivity.java:187)
    at android.app.Activity.dispatchActivityResult(Activity.java:5514)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:3597)
    ... 14 more

谢谢。

Answer 1

您应该在onLayout() 事件之后或内部调用getWidth() 和getHeight() 方法。这是该过程的更详细描述 How Android Draws Views.

尝试在这个方法中调用frame.getWidth()，你会发现它的结果与0不同。

frame.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
    @Override
    public void onLayoutChange(View v, int left, int top, 
                               int right, int bottom, 
                               int oldLeft, int oldTop, 
                               int oldRight, int oldBottom) {
        int w = frame.getWidth();
    }
});