View getLocationInWindow getLocationOnScreen

最新推荐文章于 2022-06-20 10:36:26 发布

转载最新推荐文章于 2022-06-20 10:36:26 发布 · 3.6k 阅读

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本文介绍了如何通过编程方法解决在Android应用中计算某个View相对于MainView的y坐标的问题，包括获取View的位置信息、计算偏移量及应用实例。

I ended up solving this issue by determining the height of the status/notification bar like so:

View globalView = ...; // the main view of my activity/application

DisplayMetrics dm = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(dm);
int topOffset = dm.heightPixels - globalView.getMeasuredHeight();

View tempView = ...; // the view you'd like to locate
int[] loc = new int[2]; 
tempView.getLocationOnScreen(loc);

final int y = loc[1] - topOffset;

这段代码的作用是，在View中（不包含title）计算某个view相对Main View的y坐标

int[] location = new int[2] ;
view.getLocationInWindow(location); //获取在当前窗口内的绝对坐标
view.getLocationOnScreen(location);//获取在整个屏幕内的绝对坐标
location [0]--->x坐标,location [1]--->y坐标
如果在Activity的OnCreate()事件输出那些参数，是全为0，要等UI控件都加载完了才能获取到这些。

 private ViewFlipper flipper;
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
            Log.i("demo", "onCreate");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        flipper = (ViewFlipper)findViewById(R.id.flipper);
        Log.d("demo", "left:" + flipper.getLeft());
        Log.d("demo", "right:" + flipper.getRight());
        Log.d("demo", "Top:" + flipper.getTop());
        Log.d("demo", "Bottom:" + flipper.getBottom());
        
        Button btn = (Button)findViewById(R.id.button2);
        btn.setOnClickListener(new OnClickListener(){
                        public void onClick(View v) {
                                Log.i("demo", "onClick");
                                Log.d("demo", "left:" + flipper.getLeft());
                                Log.d("demo", "right:" + flipper.getRight());
                                Log.d("demo", "Top:" + flipper.getTop());
                                Log.d("demo", "Bottom:" + flipper.getBottom());
                        }
        });
    }