【实例简介】

【实例截图】

【核心代码】

package com.yfz;

import com.yfz.view.MyTextView;

import android.app.Activity;

import android.graphics.Rect;

import android.os.Bundle;

import android.view.Gravity;

import android.view.View;

import android.view.WindowManager;

import android.view.View.OnClickListener;

import android.view.WindowManager.LayoutParams;

import android.widget.Button;

public class TopFrame extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button button = (Button) findViewById(R.id.bt);

button.setOnClickListener(onclick);

}

private MyTextView tv = null;

OnClickListener onclick = new OnClickListener() {

@Override

public void onClick(View v) {

if(tv != null && tv.isShown()){

WindowManager wm = (WindowManager)getApplicationContext().getSystemService(TopFrame.this.WINDOW_SERVICE);

wm.removeView(tv);

}

show();

}

};

private void show(){

Rect frame = new Rect();

getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

MyTextView.TOOL_BAR_HIGH = frame.top;

WindowManager wm = (WindowManager)getApplicationContext().getSystemService(WINDOW_SERVICE);

WindowManager.LayoutParams params = MyTextView.params;

params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT | WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;

params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE;

params.width = WindowManager.LayoutParams.FILL_PARENT;

params.height = WindowManager.LayoutParams.WRAP_CONTENT;

params.alpha = 80;

params.gravity=Gravity.LEFT|Gravity.TOP;

//以屏幕左上角为原点，设置x、y初始值

params.x = 0;

params.y = 0;

tv = new MyTextView(TopFrame.this);

wm.addView(tv, params);

}

@Override

protected void onDestroy() {

// TODO Auto-generated method stub

WindowManager wm = (WindowManager)getApplicationContext().getSystemService(WINDOW_SERVICE);

//if(tv != null && tv.isShown()){

//wm.removeView(tv);

//}

super.onDestroy();

}

}