SurfaceView 单线程与多线程画图的比较例子

来源：互联网发布：worth it 舞蹈编辑：程序博客网时间：2024/05/01 03:15

资源里有用到的四张图：

main.xml :

<?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" >    <LinearLayout android:id="@+id/LinearLayout01"          android:layout_width="wrap_content" android:layout_height="wrap_content">          <Button android:id="@+id/Button01" android:layout_width="wrap_content"              android:layout_height="wrap_content" android:text="单个独立线程"></Button>          <Button android:id="@+id/Button02" android:layout_width="wrap_content"              android:layout_height="wrap_content" android:text="两个独立线程"></Button>        <Button android:id="@+id/Button04" android:layout_width="wrap_content"              android:layout_height="wrap_content" android:text="停止"></Button>          <Button android:id="@+id/Button03" android:layout_width="wrap_content"              android:layout_height="wrap_content" android:text="退出"></Button>    </LinearLayout>      <SurfaceView android:id="@+id/SurfaceView01"          android:layout_width="fill_parent" android:layout_height="fill_parent"></SurfaceView>  </LinearLayout>

java代码：

package com.vince.base;import java.lang.reflect.Field;import java.util.ArrayList;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;import android.os.Bundle;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.Button;public class SurfaceViewWithThreadDemo extends Activity {    /** Called when the activity is first created. */Button btnSingleThread, btnDoubleThread, btnExit, btnStop;      SurfaceView sfv;      SurfaceHolder sfh;      ArrayList<Integer> imgList = new ArrayList<Integer>();      int imgWidth, imgHeight;      Bitmap bitmap;        Bitmap[] bitmapArray;//图片缓冲区    boolean[] bitmapFlag;//图片是否缓冲好的标志    int arraySize;//缓冲区大小    Load_DrawImage load_DrawImage;//单线程读写的线程    LoadImage loadImage;//多线程读图片的线程    DrawImage drawImage;//多线程画图片的线程        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                btnSingleThread = (Button) this.findViewById(R.id.Button01);          btnDoubleThread = (Button) this.findViewById(R.id.Button02);          btnExit = (Button) this.findViewById(R.id.Button03);        btnStop = (Button) this.findViewById(R.id.Button04);                btnSingleThread.setOnClickListener(new ClickEvent());          btnDoubleThread.setOnClickListener(new ClickEvent());          btnExit.setOnClickListener(new ClickEvent());        btnStop.setOnClickListener(new ClickEvent());                sfv = (SurfaceView) this.findViewById(R.id.SurfaceView01);          sfh = sfv.getHolder();          sfh.addCallback(new MyCallBack());// 自动运行surfaceCreated以及surfaceChanged                  load_DrawImage = null;        loadImage = null;        drawImage = null;    }        class ClickEvent implements View.OnClickListener {                @Override          public void onClick(View v) {                if (v == btnSingleThread)             {            if(load_DrawImage == null)            load_DrawImage = new Load_DrawImage(0, 0);                if(!load_DrawImage.isAlive())                load_DrawImage.start();//单线程读取并绘图              }             else if (v == btnDoubleThread)             {              if(loadImage == null)            loadImage = new LoadImage();            if(!loadImage.isAlive())             loadImage.start();//读取线程            if(drawImage == null)            drawImage = new DrawImage(imgWidth + 10, 0);            if(!drawImage.isAlive())            drawImage.start();//绘图线程            }              else if (v == btnExit)            {//退出时先关闭线程            if(load_DrawImage != null && load_DrawImage.isAlive())            {            load_DrawImage.interrupt();            try {load_DrawImage.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}            load_DrawImage = null;            }            if(loadImage != null && loadImage.isAlive())             {            loadImage.interrupt();            try {loadImage.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}            loadImage = null;            }            if(drawImage != null && drawImage.isAlive())             {            drawImage.interrupt();            try {drawImage.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}            drawImage = null;            }            System.exit(0);            }            else if( v == btnStop)            {//停止所有线程            if(load_DrawImage != null && load_DrawImage.isAlive())            {            load_DrawImage.interrupt();            try {load_DrawImage.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}            load_DrawImage = null;            }            if(loadImage != null && loadImage.isAlive())             {            loadImage.interrupt();            try {loadImage.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}            loadImage = null;            }            if(drawImage != null && drawImage.isAlive())             {            drawImage.interrupt();            try {drawImage.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}            drawImage = null;            }            }        }        }          class MyCallBack implements SurfaceHolder.Callback {                @Override          public void surfaceChanged(SurfaceHolder holder, int format, int width,                  int height) {              Log.i("Surface:", "Change");            }            @Override          public void surfaceCreated(SurfaceHolder holder) {              Log.i("Surface:", "Create");                // 用反射机制来获取资源中的图片ID和尺寸              Field[] fields = R.drawable.class.getDeclaredFields();              for (Field field : fields) {                  if (!"ic_launcher".equals(field.getName()))// 除了ic_launcher之外的图片                  {                      int index = 0;                      try {                          index = field.getInt(R.drawable.class);                      } catch (IllegalArgumentException e) {                          // TODO Auto-generated catch block                          e.printStackTrace();                      } catch (IllegalAccessException e) {                          // TODO Auto-generated catch block                          e.printStackTrace();                      }                      // 保存图片ID                      imgList.add(index);                  }              }              // 取得图像大小              Bitmap bmImg = BitmapFactory.decodeResource(getResources(),                      imgList.get(0));              imgWidth = bmImg.getWidth();              imgHeight = bmImg.getHeight();                         arraySize = 2;//缓冲区大小            bitmapArray = new Bitmap[arraySize];            bitmapFlag = new boolean[arraySize];            for(int s = 0; s < arraySize; s++)            {            bitmapFlag[s] = false;//初始化为图片没缓冲好            }        }            @Override          public void surfaceDestroyed(SurfaceHolder holder) {              Log.i("Surface:", "Destroy");            }        }          /*      * 读取并显示图片的线程      */      class Load_DrawImage extends Thread {          int x, y;          int imgIndex = 0;            public Load_DrawImage(int x, int y) {              this.x = x;              this.y = y;          }            public void run() {              while (true) {              if(Thread.interrupted()) break;                Canvas c = sfh.lockCanvas(new Rect(this.x, this.y, this.x                          + imgWidth, this.y + imgHeight));                  Bitmap bmImg = BitmapFactory.decodeResource(getResources(),                          imgList.get(imgIndex));                  c.drawBitmap(bmImg, this.x, this.y, new Paint());                  imgIndex++;                  if (imgIndex == imgList.size())                      imgIndex = 0;                    sfh.unlockCanvasAndPost(c);// 更新屏幕显示内容              }          }      };        /*      * 只负责绘图的线程      */      class DrawImage extends Thread {          int x, y;          int i;          public DrawImage(int x, int y) {              this.x = x;              this.y = y;          }            public void run() {          i = 0;            while (true) {              if(Thread.interrupted()) break;            /*                if (bitmap != null) {//如果图像有效                      Canvas c = sfh.lockCanvas(new Rect(this.x, this.y, this.x                              + imgWidth, this.y + imgHeight));                        c.drawBitmap(bitmap, this.x, this.y, new Paint());                        sfh.unlockCanvasAndPost(c);// 更新屏幕显示内容                }                  */            if(bitmapFlag[i])            {            if (bitmapArray[i] != null) {//如果图像有效                          Canvas c = sfh.lockCanvas(new Rect(this.x, this.y, this.x                                  + imgWidth, this.y + imgHeight));                          c.drawBitmap(bitmapArray[i], this.x, this.y, new Paint());                          sfh.unlockCanvasAndPost(c);// 更新屏幕显示内容                    }            bitmapFlag[i] = false;            }            i++;            if(i == arraySize)            {            i = 0;            }            }          }      };          /*      * 只负责读取图片的线程      */      class LoadImage extends Thread {        int imgIndex = 0;          int i;          public void run() {         i = 0;            while (true) {          if(Thread.interrupted()) break;            /*                bitmap = BitmapFactory.decodeResource(getResources(),                          imgList.get(imgIndex));                  imgIndex++;                  if (imgIndex == imgList.size())//如果到尽头则重新读取                      imgIndex = 0;                  */            if(!bitmapFlag[i])            {            bitmapArray[i] = BitmapFactory.decodeResource(getResources(),                              imgList.get(imgIndex));                      imgIndex++;                      if (imgIndex == imgList.size())//如果到尽头则重新读取                      {                    imgIndex = 0;                    }            bitmapFlag[i] = true;            }            i++;            if(i == arraySize)            {            i = 0;            }            }          }      };  }

没了。