Android PopupWindow简单使用

import com.stone.R;import android.app.Activity;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout.LayoutParams;import android.widget.PopupWindow;public class PopupWindowActivity extends Activity {      @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.popup_activity);        LayoutInflater inflater = LayoutInflater.from(this);                // 引入窗口配置文件        View view = inflater.inflate(R.layout.popupwindow, null);        // 创建PopupWindow对象        final PopupWindow pop = new PopupWindow(view, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, false);        final Button btn = (Button) findViewById(R.id.btn);        // 需要设置一下此参数，点击 外边可消失        Drawable d = getResources().getDrawable(R.drawable.a2);        pop.setBackgroundDrawable(d);        //设置点击窗口外边窗口消失        pop.setOutsideTouchable(true);        // 设置此参数获得焦点，否则无法点击        pop.setFocusable(true);        btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if(pop.isShowing()) {// 隐藏窗口，如果设置了点击窗口外时隐藏,该方式可以不需要pop.dismiss();} else {//pop.showAsDropDown(v);// 显示窗口 在v下面/* * show at parentView,  gravity 右上， x(左|右)偏移，y(上|下)偏移 */pop.showAtLocation(getWindow().getDecorView(), Gravity.RIGHT|Gravity.TOP, btn.getWidth()/2, btn.getHeight()/2);}}});    }}
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