android开发实例03:屏幕截图并调用邮件发送

如果做过移动办公软件，或者掌上BI软件话，一般就会有一项功能，就是用户可以当前屏幕的显示的报表或者数据，截图并发送功能。

 

 

其中有一个开发时候的小技巧：

 

  /*
* 用email.setType("image/png");或者email.setType(
* "application/octet-stream"); 都不会影响邮件的发送
* 为什么email.setType("image/png"
* );而不用email.setType("application/octet-stream"); ?
* 因为在开发中发现setType("image/png")，系统会同时给你调用彩信，邮件，等.....
*/

 

 

下面和大家分享下实现~~

 

package com.johnson.Screenshot;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Environment;
import android.os.StatFs;
import android.view.View;
import android.widget.Toast;

public class ScreenshotTools {

   /***
    * @author Johnson
    *    
    * */

   public static long minSizeSDcard = 50;
   public static String filePath = Environment.getExternalStorageDirectory()
      + "/FJBICache";
   public static String fileName = "chart.png";
   public static String detailPath = filePath + File.separator + fileName;
   public static final int SEND_EMAIL = 1;

   // public static String detailPath="/sdcard/FjbiCache/chart.png";

   /**
    * 调用系统程序发送邮件
    *    
    * @author Johnson
    *    
    * */

   private static void sendEmail(Context context, String[] to, String subject,
      String body, String path) {

    Intent email = new Intent(android.content.Intent.ACTION_SEND);

     if (to != null) {
      email.putExtra(android.content.Intent.EXTRA_EMAIL, to);
    }
     if (subject != null) {
      email.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
    }
     if (body != null) {
      email.putExtra(android.content.Intent.EXTRA_TEXT, body);
    }
     if (path != null) {

       /*
        * 用email.setType("image/png");或者email.setType(
        * "application/octet-stream"); 都不会影响邮件的发送
        * 为什么email.setType("image/png"
        * );而不用email.setType("application/octet-stream"); ?
        * 因为在开发中发现setType("image/png")，系统会同时给你调用彩信，邮件，等.....
        */

      File file = new File(path);
      email.putExtra(android.content.Intent.EXTRA_STREAM,
          Uri.fromFile(file));
      email.setType( "image/png");
    }
    context.startActivity(Intent.createChooser(email, "请选择发送软件"));

  }

   /**
    * 获取指定Activity的截屏，保存到png文件
    *    
    * @author Johnson
    * **/

   private static Bitmap takeScreenShot(Activity activity) {
     // View是你需要截图的View
    View view = activity.getWindow().getDecorView();
    view.setDrawingCacheEnabled( true);
    view.buildDrawingCache();
    Bitmap b1 = view.getDrawingCache();

     // 获取状态栏高度
    Rect frame = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
     int statusBarHeight = frame.top;
    System.out.println(statusBarHeight);

     // 获取屏幕长和高
     int width = activity.getWindowManager().getDefaultDisplay().getWidth();
     int height = activity.getWindowManager().getDefaultDisplay()
        .getHeight();
     // 去掉标题栏
     // Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455);
    Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height
        - statusBarHeight);
    view.destroyDrawingCache();
     return b;
  }

   /**
    * 截图保存
    *    
    * @author Johnson
    * **/
   private static void savePic(Bitmap b, String filePath, String fileName) {

    File f = new File(filePath);

     if (!f.exists()) {
      f.mkdir();
    }
    FileOutputStream fos = null;
     try {
      fos = new FileOutputStream(filePath + File.separator + fileName);
       if ( null != fos) {
        b.compress(Bitmap.CompressFormat.PNG, 90, fos);
        fos.flush();
        fos.close();
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

   /**
    *    
    * 截屏并发送邮件
    *    
    * @author Johnson
    * **/
   public static void takeScreenShotToEmail(Context context, Activity a) {

     if (getAvailableSDcard(context)) {
      savePic(takeScreenShot(a), filePath, fileName);

       // selectDialog(context);
      sendEmail(context, null, null, null, detailPath);
    }

  }

   /***
    * Sd判断SD卡是否可用
    *    
    * @author Johnson minSizeSDcard>50kb
    * */

   public static boolean getAvailableSDcard(Context context) {

     boolean sdCardExist = Environment.getExternalStorageState().equals(
        android.os.Environment.MEDIA_MOUNTED); // 判断sd卡是否存在

    System.out.println( "+++" + sdCardExist);
     if (sdCardExist) {
      File path = Environment.getExternalStorageDirectory();
      StatFs stat = new StatFs(path.getPath());
       long blockSize = stat.getBlockSize();
       long availableBlocks = stat.getAvailableBlocks();
       long sdCardSize = (availableBlocks * blockSize) / 1024; // KB值

       if (sdCardSize > minSizeSDcard) {
        System.out.println( "SDcardSize:::" + minSizeSDcard + "KB");
         return true;
      } else {
        Toast.makeText(context, "SD卡空间不足", Toast.LENGTH_SHORT).show();
      }

    } else {
      Toast.makeText(context, "请在使用转发功能之前插入SD卡", Toast.LENGTH_SHORT)
          .show();

    }
     return false;
  }

}

 

 

 

package com.johnson.Screenshot;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ScreenshotActivity extends Activity {
         /** Called when the activity is first created. */
    
  Button bt;
  Context mContext;
        @Override
         public void onCreate(Bundle savedInstanceState) {
                 super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                bt=(Button)findViewById(R.id.button1);
                mContext= this;
                bt.setOnClickListener( new OnClickListener() {
        
      @Override
       public void onClick(View v) {
         // TODO Auto-generated method stub
        ScreenshotTools.takeScreenShotToEmail(mContext, ScreenshotActivity. this);
      }
    });
                
                
                
        }
}

 

 

 

<? xml version ="1.0" encoding ="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
         android:layout_width ="fill_parent"
         android:layout_height ="fill_parent"
         android:orientation ="vertical" >



         < Button
                 android:id ="@+id/button1"
                 android:layout_width ="wrap_content"
                 android:layout_height ="wrap_content"
                 android:text ="@string/button_text" />

</ LinearLayout >