Android PopupWindow的使用!!!

大家好，我們這一節講的是Android PopupWindow的使用! 在我理解其實PopupWindow其實類似於一個不能動的Widget(僅從顯示效果來說!)

 

它是浮在別的窗口之上的.

 

下面我將給大家做一個簡單的Demo，類似於音樂播放器的Widget的效果，點擊Button的時候出來PopupWindow,首先我們看一下效果圖:

 

 

 

下面是核心代碼:

 

package com.android.tutor;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.PopupWindow;
public class PopupWindowDemo extends Activity  implements OnClickListener{
    private Button btn;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn = (Button)findViewById(R.id.btn);
        btn.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        Context mContext = PopupWindowDemo.this;
        if (v.getId() == R.id.btn) {
            LayoutInflater mLayoutInflater = (LayoutInflater) mContext
                    .getSystemService(LAYOUT_INFLATER_SERVICE);
            View music_popunwindwow = mLayoutInflater.inflate(
                    R.layout.music_popwindow, null);
            PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow, LayoutParams.FILL_PARENT,
                    LayoutParams.WRAP_CONTENT);

            mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.RIGHT|Gravity.BOTTOM, 0, 0);
        }
    }
}

需要強調的是這裏PopupWindow必須有某個事件觸發纔會顯示出來，不然總會抱錯，不信大家可以試試!

 

隨着這個問題的出現，就會同學問了，那麼我想初始化讓PopupWindow顯示出來，那怎麼辦了，不去寄託於其他點擊事件，

 

在這裏我用了定時器Timer來實現這樣的效果,當然這裏就要用到Handler了，如果大家不理解的可以返回

Android 高手進階教程(九)之----Android Handler的使用!! 看一看，加深瞭解:

 

下面是核心代碼:

 

package com.android.tutor;
import <a href="http://lib.csdn.net/base/javase" class='replace_word' title="Java SE知識庫" target='_blank' style='color:#df3434; font-weight:bold;'>Java</a>.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;
public class PopupWindowDemo extends Activity{
    private Handler mHandler = new Handler(){

        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 1:
                showPopupWindow();
                break;
            }
        };
    };

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //create the timer
        Timer timer = new Timer();
        timer.schedule(new initPopupWindow(), 100);
    }

    private class initPopupWindow extends TimerTask{
        @Override
        public void run() {

            Message message = new Message();
            message.what = 1;
            mHandler.sendMessage(message);

        }
    }


    public void showPopupWindow() {
        Context mContext = PopupWindowDemo.this;
        LayoutInflater mLayoutInflater = (LayoutInflater) mContext
                .getSystemService(LAYOUT_INFLATER_SERVICE);
        View music_popunwindwow = mLayoutInflater.inflate(
                R.layout.music_popwindow, null);
        PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow,
                LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
        mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.CENTER, 0, 0);
    }
}

 

效果如下圖:

 

 

這樣就可以初始化PopupWindow了,呵呵，這一節的佈局文件有點多，如果大家想要源碼的話，留下你們的Email,我會盡快發送給大家的

，今天就到這裏，大家有什麼不明白的歡迎留言!!!謝謝~

 

要源碼的太多，我快崩潰了，所以上傳了。下載地址:http://d.download.csdn.net/down/2871531/Android_Tutor

轉自：http://blog.csdn.net/android_tutor/article/details/5576533