如何在android中以编程方式获取相对 - 线性布局的宽度和高度？

Question

我需要相对/线性布局的运行时尺寸.

activity_home.xml:

<RelativeLayout
    android:id="@+id/rlParent"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</RelativeLayout>

HomeActivity.java:

private int width, height;

RelativeLayout rlParent = (RelativeLayout) findViewById(R.id.rlParent);

w = rlParent.getWidth();
h = rlParent.getHeight();

Log.i("Width-Height", width+"-"+height);

请分享你的想法.

Answer 1

试试这个

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    // TODO Auto-generated method stub
    super.onWindowFocusChanged(hasFocus);
    updateSizeInfo();
}

private void updateSizeInfo() {
    RelativeLayout rlayout = (RelativeLayout) findViewById(R.id.rlayout);
    w = rlayout.getWidth();
    h = rlayout.getHeight();
    Log.v("W-H", w+"-"+h);
}

Answer 2

您可以将 OnGlobalLayoutListener 附加到相对布局的 ViewTreeObserver ，当视图附加到窗口并为其分配实际高度时，该布局将被调用。

final RelativeLayout rl_cards_details_card_area = (RelativeLayout) findViewById(R.id.rl_cards_details_card_area);
        rl_cards_details_card_area.getViewTreeObserver()
                .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

                    @Override
                    public void onGlobalLayout() {
                        // TODO Auto-generated method stub
                        int w = rl_cards_details_card_area.getWidth();
                        int h = rl_cards_details_card_area.getHeight();
                        Log.v("W-H", w + "-" + h);
                        rl_cards_details_card_area.getViewTreeObserver()
                                .removeOnGlobalLayoutListener(this);
                    }
                });

Answer 3

那么我已经通过这种方式实现了：

LinearLayout linearLayout = (LinearLayout)findViewById(R.id.layout);
ViewTreeObserver viewTreeObserver = linearLayout.getViewTreeObserver(); 
viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
    @Override 
    public void onGlobalLayout() { 
        linearLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
        int width  = linearLayout.getMeasuredWidth();
        int height = linearLayout.getMeasuredHeight(); 

    } 
});

这个例子是线性布局，相对布局遵循相同的过程。

希望这会帮助你。