Android 如何将Canvas上绘制的内容保存成本地图片（转）

效果如下图所示

保存在sd卡上的文件为

手机上显示效果为：

1》》在Manifest文件中增加相应权限

 <!-- 在SDCard中创建与删除文件权限 -->
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
 <!-- 往SDCard写入数据权限 -->
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

例如我的Manifest文件代码如下：

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.demo.picturetest"
     android:versionCode="1"
     android:versionName="1.0" >  

     <!-- 在SDCard中创建与删除文件权限 -->
     <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
     <!-- 往SDCard写入数据权限 -->
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  

     <uses-sdk
         android:minSdkVersion="8"
         android:targetSdkVersion="19" />  

     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />  

                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     </application>  

 </manifest>  

2》》详细代码如下

 package com.demo.picturetest;  

 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;  

 import android.app.Activity;
 import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.os.Bundle;
 import android.os.Environment;
 import android.util.Log;
 import android.widget.ImageView;  

 public class MainActivity extends Activity {
     private Bitmap mBitmap;
     // 画布
     private Canvas mCanvas;
     // 画笔－－画图片
     private Paint mPicturePaint = new Paint();
     // 画笔－－写字
     private Paint mTextPaint = new Paint();
     // 画笔－－写运动数据
     private Paint mDataPaint = new Paint();  

     private ImageView mImageView;  

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         drawBitmap();
         init();
         // 展示
         mImageView.setImageBitmap(mBitmap);  

     }  

     private void init() {
         mImageView = (ImageView) findViewById(R.id.mImageView);
     }  

     /**
      * 根据图片和文字生成图片
      * */
     private void drawBitmap() {  

         Bitmap bm_bg = BitmapFactory.decodeResource(getResources(),
                 R.drawable.dashboard_bg);
         // 得到图片的宽、高
         int width_bg = bm_bg.getWidth();
         int height_bg = bm_bg.getHeight();  

         // 创建一个你需要尺寸的Bitmap
         mBitmap = Bitmap.createBitmap(width_bg, height_bg, Config.ARGB_8888);
         // 用这个Bitmap生成一个Canvas,然后canvas就会把内容绘制到上面这个bitmap中
         mCanvas = new Canvas(mBitmap);  

         // 绘制背景图片
         mCanvas.drawBitmap(bm_bg, 0.0f, 0.0f, mPicturePaint);
         // 绘制图片
         Bitmap bm_head = BitmapFactory.decodeResource(getResources(),
                 R.drawable.share_head_img);  

         // 得到图片的宽、高
         int width_head = bm_head.getWidth();
         int height_head = bm_head.getHeight();
         // 绘制图片－－保证其在水平方向居中
         mCanvas.drawBitmap(bm_head, (width_bg - width_head) / 2, 0.0f,
                 mPicturePaint);  

         // 绘制文字
         mTextPaint.setColor(Color.WHITE);// 白色画笔
         mTextPaint.setTextSize(80.0f);// 设置字体大小  

         // 绘制文字
         mDataPaint.setColor(Color.RED);// 红色画笔
         mDataPaint.setTextSize(120.0f);// 设置字体大小  

         String distanceTextString = "运动距离：";
         String distanceDataString = String.valueOf(888);
         String distanceScalString = "米";  

         float distanceTextString_width = mTextPaint.measureText(
                 distanceTextString, 0, distanceTextString.length());  

         float distanceDataString_width = mDataPaint.measureText(
                 distanceDataString, 0, distanceDataString.length());
         float distanceScalString_width = mTextPaint.measureText(
                 distanceScalString, 0, distanceScalString.length());
         float x = (width_bg - distanceTextString_width
                 - distanceDataString_width - distanceScalString_width) / 2;  

         mCanvas.drawText(distanceTextString, x, height_head, mTextPaint);// 绘制文字
         mCanvas.drawText(distanceDataString, x + distanceTextString_width,
                 height_head, mDataPaint);// 绘制文字  

         mCanvas.drawText(distanceScalString, x + distanceTextString_width
                 + distanceDataString_width, height_head, mTextPaint);// 绘制文字  

         // 保存绘图为本地图片
         mCanvas.save(Canvas.ALL_SAVE_FLAG);
         mCanvas.restore();  

         File file = new File(Environment.getExternalStorageDirectory()
                 .getPath() + "/share_pic.png");// 保存到sdcard根目录下，文件名为share_pic.png
         Log.i("CXC", Environment.getExternalStorageDirectory().getPath());
         FileOutputStream fos = null;
         try {
             fos = new FileOutputStream(file);
             mBitmap.compress(Bitmap.CompressFormat.PNG, 50, fos);  

         } catch (FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         try {
             fos.close();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }  

     }
 }  

转自：http://blog.csdn.net/cxc19890214/article/details/39924951