Question

我有Activity，会显示由2部分组成的自定义视图。我希望一部分是可见屏幕高度的1/3，另一部分是2/3。

我可以覆盖onMeasure()并使用显示指标来查找显示的高度，但这并不考虑电池条或视图标题大小。

DisplayMetrics dm = new DisplayMetrics(); 
((WindowManager)contxt.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(dm); 
int height = dm.heightPixels;

如何判断可显示区域的高度？我准备覆盖layout或其他什么。 Android的最佳做法是什么？我已经看到了这条线上的其他问题，但它们尚无定论。

Answer 1

我想出了办法。我重写RelativeLayout，并让它保持指向我的上下视图的指针。然后当它处理onMeasure时，它会在我的2个视图上设置所需的高度。它们在处理onMeasure时使用所需的高度。这给了我一个可见区域的2/3视图，下面是另一个视图。

- 来自我的布局类

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    // set default screen heights
    int heightSize = MeasureSpec.getSize(heightMeasureSpec);
    if ( upper != null )
        upper.setPrefHeight((heightSize*2)/3);
    if ( lower != null )
        lower.setPrefHeight(heightSize/3);

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

- 来自View派生类

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    setMeasuredDimension(measureWidth(widthMeasureSpec),
            measureHeight(heightMeasureSpec));
}

/**
 * Determines the width of this view
 * @param measureSpec A measureSpec packed into an int
 * @return The width of the view, honoring constraints from measureSpec
 */
private int measureWidth(int measureSpec) {
    int result = 0;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);

    if (specMode == MeasureSpec.EXACTLY) {
        // We were told how big to be
        result = specSize;
    } else {
        DisplayMetrics dm = new DisplayMetrics(); 
        ((WindowManager)contxt.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(dm); 
        result = dm.widthPixels; 
    }
    width = result;
    return result;
}

/**
 * Determines the height of this view
 * @param measureSpec A measureSpec packed into an int
 * @return The height of the view, honoring constraints from measureSpec
 */
private int measureHeight(int measureSpec) {
    int result = 0;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);

    if (specMode == MeasureSpec.EXACTLY) {
        // We were told how big to be
        result = specSize;
    } else {
        result = prefHeight;
    }
    height = result;

    return result;
}

如何正确调整包含视图的大小

1 个答案: