使用bringChildToFront()将view显示在屏幕最前方

public abstract void bringChildToFront (View child)
把该视图置于其他所有子视图之上，如在FrameLayout中切换被叠放的视图。

该方法出自public interface ViewParent

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.style.AbsoluteSizeSpan;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.AbsoluteLayout;
import android.widget.Button;

public class HelloWorld2 extends Activity {
    /** Called when the activity is first created. */
	
	AbsoluteLayout mLayoutGroup = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        
        mLayoutGroup = new AbsoluteLayout(this);
        AbsoluteLayout.LayoutParams layoutParams = new AbsoluteLayout.LayoutParams
        (320, 480, 0, 0);
        
        setContentView(mLayoutGroup, layoutParams);
        
        Button button= new Button(this);
        button.setText("testButton");
        layoutParams = new AbsoluteLayout.LayoutParams(120, 60, 20, 20);
        mLayoutGroup.addView(button, layoutParams);
        button.setOnTouchListener(touchListener);
        
        final Button btButton = new Button(this);
        btButton.setText("测试按钮移动");
        layoutParams = new AbsoluteLayout.LayoutParams(120, 60, 20, 160);
        mLayoutGroup.addView(btButton, layoutParams);
        btButton.setOnTouchListener(touchListener);
    }
    
    OnTouchListener touchListener = new OnTouchListener()
    {
    	int temp[] = new int[]{0, 0};
		public boolean onTouch(View arg0, MotionEvent arg1) {
			// TODO Auto-generated method stub
			int eventAction = arg1.getAction();
			Log.e("testButtonMove", "OnTouchAction:"+eventAction);
			
			int x = (int)arg1.getRawX();
			int y = (int)arg1.getRawY();
			
			switch (eventAction) {
			case MotionEvent.ACTION_DOWN:
				
				temp[0] = (int)arg1.getX();
				temp[1] = (int)(y-arg0.getTop());	
				
				mLayoutGroup.bringChildToFront(arg0);
				arg0.postInvalidate();
				
				break;
			case MotionEvent.ACTION_MOVE:
				
				int left = x - temp[0];
				int top = y - temp[1];
				int right = left + arg0.getWidth();
				int bottom = top + arg0.getHeight();
				
				arg0.layout(left, top, right, bottom);
				arg0.postInvalidate();
				
				break;

			default:
				break;
			}
			
			return false;
		}
    };
}

评论

2 楼 h406621397 2016-12-28  

引用

[b]                   :ar  row:  [/b]

1 楼 solen 2014-06-03  

　　View v = findViewById(R.id.content);//找到你要设透明背景的layout 的id
　　v.getBackground().setAlpha(100);//0~255透明度值

or
    view.bringToFront() 可以讲布局在下层的控件放到上层，不被其他控件挡住。