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