}

if (mPop.isShowing()) {

mPop.dismiss();

}

}

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

bt1 = (Button)findViewById(R.id.bt1);

bt2 = (Button)findViewById(R.id.bt2);

bt3 = (Button)findViewById(R.id.bt3);

bt4 = (Button)findViewById(R.id.bt4);

bt5 = (Button)findViewById(R.id.bt5);

layout = View.inflate(this, R.layout.window, null);

gv = (GridView) layout.findViewById(R.id.gv);

MyAdapter adapter=new MyAdapter(this,items,icons);

gv.setAdapter(adapter);

bt1.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

initPopWindow();

mPop.showAsDropDown(v);//以這個Button為anchor(可以理解為錨，基準(zhǔn))，在下方彈出

}});

bt2.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

initPopWindow();

mPop.showAsDropDown(v,20,-20);//橫軸偏移20，縱軸-20，一個狀態(tài)欄的長度

}});

bt3.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

initPopWindow();

mPop.showAtLocation(PopWindow.this.findViewById(R.id.rl),

Gravity.CENTER, 0, 0);//在屏幕居中，無偏移

}});

bt4.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

initPopWindow();

mPop.showAtLocation(PopWindow.this.findViewById(R.id.rl),

Gravity.TOP | Gravity.LEFT, 20, 20);//在屏幕頂部|居右，帶偏移

}});

bt5.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

if (mPop != null) {

mPop.dismiss();

}

}});

}

public boolean onKeyDown(int keyCode, KeyEvent event){

//截獲按鍵事件

if(keyCode == KeyEvent.KEYCODE_MENU){

initPopWindow();

mPop.showAtLocation(this.findViewById(R.id.rl),

Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0); //在屏幕底部

}else if(keyCode == KeyEvent.KEYCODE_BACK){

if(mPop.isShowing()){

mPop.dismiss();

}else{

System.exit(0);

}

}

return false;

}

}

只有一個GridView。main.xml就不貼了，就幾個Button。

當(dāng)然彈窗的作用不僅限于menu，你還可以用他做的更多來為你UI增色。