android - 创建屏幕外布局的位图

Question

我必须得到布局的位图(比如第二个屏幕)之前(可以说没有)将它带到前台屏幕。我提到了this邮政。我在夸大 View 的某个地方犯了错误。注意:

1. Must not show the inflated screen (second screen)
2. Must not attach it to the parent view

我的代码 fragment 在这里:

private Bitmap renderNextScreen() {
    
    // Getting width, height device
    Display display = ((WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    int width = display.getWidth();
    int height = display.getHeight();
    
    Log.i(TAG, "Width- " + width+" Height - "+height);

    // Create a mutable bitmap
    Bitmap secondScreen = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    
    // Created a canvas using the bitmap
    Canvas c = new Canvas(secondScreen);
    
    // Inflated the second screen
    LayoutInflater inflater = LayoutInflater.from(this);
    View secondView = inflater.inflate(R.layout.secondscreen, null);
    
    Log.i(TAG, "secondView.Height- "+secondView.getHeight()+" , secondView.Width " + secondView.getWidth());
    // Drawn the inflated view to canvas
    secondView.draw(c);
    
    preview.setImageBitmap(secondPage); // preview is the Imageview inside first screen
    return secondScreen;
}

我的高度、宽度日志:

01-28 02:12:35.926: I/FirstActivity(21831): Width- 480 Height - 800
01-28 02:30:08.287: I/FirstActivity(22207): secondView.Height- 0 , secondView.Width 0

我的预览总是空白的。谢谢。

Answer 1

我认为改变:

View secondView = inflater.inflate(R.layout.secondscreen, null);

到:

View secondView = inflater.inflate(R.layout.secondscreen, null, false);

然后您需要为膨胀 View 声明布局参数，例如:

secondView.setLayoutParams(new LayoutParams(displaymetrics.widthPixels, 
displaymetrics.heightPixels/3));

Displaymetrics 是一个保存手机屏幕尺寸的变量。

然后您应该能够将该 View 转换为 bmp。