android開發實例03:屏幕截圖並調用郵件發送

如果做過移動辦公軟件，或者掌上BI軟件話，一般就會有一項功能，就是用戶可以當前屏幕的顯示的報表或者數據，截圖併發送功能。

 

 

其中有一個開發時候的小技巧：

 

 /* 
* 用email.setType("image/png");或者email.setType( 
* "application/octet-stream"); 都不會影響郵件的發送 
* 爲什麼email.setType("image/png" 
* );而不用email.setType("application/octet-stream"); ? 
* 因爲在開發中發現setType("image/png")，系統會同時給你調用彩信，郵件，等..... 
*/

 

 

下面和大家分享下實現~~

 

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"; 

  /** 
    * 調用系統程序發送郵件 
    *    
    * @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"); 都不會影響郵件的發送 
        * 爲什麼email.setType("image/png" 
        * );而不用email.setType("application/octet-stream"); ? 
        * 因爲在開發中發現setType("image/png")，系統會同時給你調用彩信，郵件，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, "請選擇發送軟件")); 

  } 

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

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

    // 獲取狀態欄高度 
    Rect frame = new Rect(); 
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); 
    int statusBarHeight = frame.top; 
    System.out.println(statusBarHeight); 

    // 獲取屏幕長和高 
    int width = activity.getWindowManager().getDefaultDisplay().getWidth(); 
    int height = activity.getWindowManager().getDefaultDisplay() 
        .getHeight(); 
    // 去掉標題欄 
    // Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455); 
    Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height 
        - statusBarHeight); 
    view.destroyDrawingCache(); 
    return b; 
  } 

  /** 
    * 截圖保存 
    *    
    * @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(); 
    } 
  } 

  /** 
    *    
    * 截屏併發送郵件 
    *    
    * @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判斷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); // 判斷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卡空間不足", Toast.LENGTH_SHORT).show(); 
      } 

    } else { 
      Toast.makeText(context, "請在使用轉發功能之前插入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>