Android PopupWindows

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今天了解到PopupWindows这个布局，PopupWindow这个类用来实现一个弹出框，可以使用任意布局的View作为其内容，这个弹出框是悬浮在当前activity之上的。

下面是一个实例

xml文件

MainActivity文件用来实现拍照获取本地图库的功能。

package cn.pb.activity;

import java.io.File;

import com.example.pb_android.R;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.AnimationUtils;
import android.view.Window;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener{

   private TextView t_send,t_ragion;
   private Button btn_images;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       this.requestWindowFeature(Window.FEATURE_NO_TITLE);
       setContentView(R.layout.activity_main);
       Init();
   }
   public void Init(){
       t_send = (TextView) findViewById(R.id.t_send);
       btn_images = (Button) findViewById(R.id.btn_images);
       t_ragion = (TextView) findViewById(R.id.t_ragion);

       t_send.setOnClickListener(this);
       btn_images.setOnClickListener(this);
       t_ragion.setOnClickListener(this);
   }
   @Override
   public void onClick(View v) {
       switch (v.getId()) {
       case R.id.t_send:
           break;
       case R.id.btn_images:
           new PopupWindows(MainActivity.this, v);
           break;
       case R.id.t_ragion:
           break;
       default:
           break;
       }
   }

   public class PopupWindows extends PopupWindow {

       public PopupWindows(Context mContext, View parent) {

           View view = View
                   .inflate(mContext, R.layout.item_popupwindows, null);
           view.startAnimation(AnimationUtils.loadAnimation(mContext,
                   R.anim.fade_ins));
           LinearLayout ll_popup = (LinearLayout) view
                   .findViewById(R.id.ll_popup);
           ll_popup.startAnimation(AnimationUtils.loadAnimation(mContext,
                   R.anim.push_bottom_in_2));

           setWidth(LayoutParams.FILL_PARENT);
           setHeight(LayoutParams.FILL_PARENT);
           setBackgroundDrawable(new BitmapDrawable());
           setFocusable(true);
           setOutsideTouchable(true);
           setContentView(view);
           showAtLocation(parent, Gravity.BOTTOM, 0, 0);
           update();
           Button bt1 = (Button) view
                   .findViewById(R.id.item_popupwindows_camera);
           Button bt2 = (Button) view
                   .findViewById(R.id.item_popupwindows_Photo);
           Button bt3 = (Button) view
                   .findViewById(R.id.item_popupwindows_cancel);
           bt1.setOnClickListener(new OnClickListener() {
               public void onClick(View v) {
                   Intent intent = new Intent(
                           MediaStore.ACTION_IMAGE_CAPTURE);
                   // 下面这句指定调用相机拍照后的照片存储的路径
                   intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri
                           .fromFile(new File(Environment
                                   .getExternalStorageDirectory(),
                                   "imageTemp.jpg")));
                   startActivityForResult(intent, 2);
                   dismiss();     //关闭Pop窗口
               }
           });
           bt2.setOnClickListener(new OnClickListener() {
               public void onClick(View v) {
                   Intent intent = new Intent(Intent.ACTION_PICK, null);
                   intent.setDataAndType(
                           MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                           "image/*");// 调用android的图库
                   startActivityForResult(intent, 1);
                   dismiss();
               }
           });
           bt3.setOnClickListener(new OnClickListener() {
               public void onClick(View v) {
                   dismiss();
               }
           });
       }
   }

}

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