Android保存位图

本文转自：http://www.blogjava.net/mixer-a/archive/2012/02/17/375034.html

本意是想实现一个视频截屏的功能，因为视频是用位图刷新显示的，因此，截屏用到了保存位图的功能，话不多说，贴代码

package xiaosi.bitmap;

import android.app.Activity;
import android.os.Bundle;

public class mianActivity extends Activity
{

	private BitmapView bitmapView = null;
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		bitmapView = new BitmapView(this);
		setContentView(bitmapView);
	}
}

package xiaosi.bitmap;

import java.io.File;
import java.io.FileOutputStream;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.view.View;

public class BitmapView extends View
{
	private Matrix matrix = null;
	public BitmapView(Context context)
	{
		super(context);
	}

	public void onDraw(Canvas canvas)
	{
		
		// 获取资源文件的引用res
		Resources res = getResources(); 
		// 获取图形资源文件
		Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.h);
		// 设置canvas画布背景为白色
		canvas.drawColor(Color.BLACK);
		canvas.drawBitmap(bmp, 0, 0, null);
		// 定义矩阵对象
		matrix = new Matrix();
		//旋转30度
		matrix.postRotate(30);
		Bitmap bitmap = Bitmap.createBitmap(bmp, 0, 50, bmp.getWidth(), bmp.getHeight()/2,
				matrix, true);
		canvas.drawBitmap(bitmap, 0, 250, null);
		SaveBitmap(bitmap);
	}
	//保存到本地
	public void SaveBitmap(Bitmap bmp)
	{
		Bitmap bitmap = Bitmap.createBitmap(800, 600, Config.ARGB_8888);  
		Canvas canvas = new Canvas(bitmap);
		//加载背景图片
		Bitmap bmps = BitmapFactory.decodeResource(getResources(), R.drawable.playerbackground);
		canvas.drawBitmap(bmps, 0, 0, null);
		//加载要保存的画面
		canvas.drawBitmap(bmp, 10, 100, null);
		//保存全部图层
		canvas.save(Canvas.ALL_SAVE_FLAG);
		canvas.restore();
		//存储路径
		File file = new File("/sdcard/song/");
		if(!file.exists())
		file.mkdirs();
		try {
			FileOutputStream fileOutputStream = new FileOutputStream(file.getPath() + "/xuanzhuan.jpg");
			bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);
			fileOutputStream.close();
			System.out.println("saveBmp is here");
		}
catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}

该文章中用到了图片的旋转功能，这个自行设置吧，而且文章是保存所有图层，这里我只保存了当前图层而已，可以阅读其API函数，网上很多的。