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Java代碼：
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- package eoe.demo;
- import Android.content.Context;
- import android.content.res.Resources;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.util.Log;
- import android.view.KeyEvent;
- import android.view.SurfaceHolder;
- import android.view.SurfaceView;
- import android.view.SurfaceHolder.Callback;
- public class MySurfaceView extends SurfaceView implements Callback, Runnable {
- private Thread th = new Thread(this);
- private SurfaceHolder sfh;
- private int SH, SW;
- private Canvas canvas;
- private Paint p;
- private Paint p2;
- private Resources res;
- private Bitmap bmp;
- private int bmp_x = 100, bmp_y = 100;
- private boolean UP, DOWN, LEFT, RIGHT;
- private int animation_up[] = { 3, 4, 5 };
- private int animation_down[] = { 0, 1, 2 };
- private int animation_left[] = { 6, 7, 8 };
- private int animation_right[] = { 9, 10, 11 };
- private int animation_init[] = animation_down;
- private int frame_count;
- public MySurfaceView(Context context) {
- super(context);
- this.setKeepScreenOn(true);
- res = this.getResources();
- bmp = BitmapFactory.decodeResource(res, R.drawable.enemy1);
- sfh = this.getHolder();
- sfh.addCallback(this);
- p = new Paint();
- p.setColor(Color.YELLOW);
- p2 = new Paint();
- p2.setColor(Color.RED);
- p.setAntiAlias(true);
- setFocusable(true); //備注1
- }
- public void surfaceCreated(SurfaceHolder holder) {
- SH = this.getHeight();
- SW = this.getWidth();
- th.start();
- }
- public void draw() {
- canvas = sfh.lockCanvas();
- canvas.drawRect(0, 0, SW, SH, p); //備注2
- canvas.save(); //備注3
- canvas.drawText("Himi", bmp_x-2, bmp_y-10, p2);
- canvas.clipRect(bmp_x, bmp_y, bmp_x + bmp.getWidth() / 13, bmp_y+bmp.getHeight());
- if (animation_init == animation_up) {
- canvas.drawBitmap(bmp, bmp_x - animation_up[frame_count] * (bmp.getWidth() / 13), bmp_y, p);
- } else if (animation_init == animation_down) {
- canvas.drawBitmap(bmp, bmp_x - animation_down[frame_count] * (bmp.getWidth() / 13), bmp_y, p);
- } else if (animation_init == animation_left) {
- canvas.drawBitmap(bmp, bmp_x - animation_left[frame_count] * (bmp.getWidth() / 13), bmp_y, p);
- } else if (animation_init == animation_right) {
- canvas.drawBitmap(bmp, bmp_x - animation_right[frame_count] * (bmp.getWidth() / 13), bmp_y, p);
- }
- canvas.restore(); //備注3
- sfh.unlockCanvasAndPost(canvas);
- }
- public void cycle() {
- if (DOWN) {
- bmp_y += 5;
- } else if (UP) {
- bmp_y -= 5;
- } else if (LEFT) {
- bmp_x -= 5;
- } else if (RIGHT) {
- bmp_x += 5;
- }
- if (DOWN || UP || LEFT || RIGHT) {
- if (frame_count < 2) {
- frame_count++;
- } else {
- frame_count = 0;
- }
- }
- if (DOWN == false && UP == false && LEFT == false && RIGHT == false) {
- frame_count = 0;
- }
- }
- @Override
- public boolean onKeyDown(int key, KeyEvent event) {
- if (key == KeyEvent.KEYCODE_DPAD_UP) {
- if (UP == false) {
- animation_init = animation_up;
- }
- UP = true;
- } else if (key == KeyEvent.KEYCODE_DPAD_DOWN) {
- if (DOWN == false) {
- animation_init = animation_down;
- }
- DOWN = true;
- } else if (key == KeyEvent.KEYCODE_DPAD_LEFT) {
- if (LEFT == false) {
- animation_init = animation_left;
- }
- LEFT = true;
- } else if (key == KeyEvent.KEYCODE_DPAD_RIGHT) {
- if (RIGHT == false) {
- animation_init = animation_right;
- }
- RIGHT = true;
- }
- return super.onKeyDown(key, event);
- }
- /* (non-Javadoc)
- * @see android.view.View#onKeyUp(int, android.view.KeyEvent)
- */
- @Override
- public boolean onKeyUp(int keyCode, KeyEvent event) {
- if (DOWN) {
- DOWN = false;
- } else if (UP) {
- UP = false;
- } else if (LEFT) {
- LEFT = false;
- } else if (RIGHT) {
- RIGHT = false;
- }
- return super.onKeyUp(keyCode, event);
- }
- @Override
- public void run() {
- // TODO Auto-generated method stub
- while (true) {
- draw();
- cycle();
- try {
- Thread.sleep(100);
- } catch (Exception ex) {
- }
- }
- }
- @Override
- public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
- // TODO Auto-generated method stub
- }
- @Override
- public void surfaceDestroyed(SurfaceHolder holder) {
- // TODO Auto-generated method stub
- }
- }
備注1
此方法是用來(lái)響應(yīng)按鍵！如果是自己定義一個(gè)繼承自View的類,重新實(shí)現(xiàn)onKeyDown方法后,只有當(dāng)該View獲得焦點(diǎn)時(shí)才會(huì)調(diào)用onKeyDown方法,Actvity中的onKeyDown方法是當(dāng)所有控件均沒有處理該按鍵事件時(shí),才會(huì)調(diào)用.
備注2
這里也是對(duì)屏幕進(jìn)行刷屏操作，其實(shí)這也只是一種，之前文章里我也用到drawRGB的方法同樣實(shí)現(xiàn)，當(dāng)然也可以用fillRect等來(lái)刷屏。
那么這里我想說下，在繼承view中，因?yàn)閛nDraw方法是系統(tǒng)自動(dòng)調(diào)用的，不像在surfaceview這里這樣去在run里面自己去不斷調(diào)用，在view中我們可以抵用 invalidate()/postInvalidate() 這兩種方法實(shí)現(xiàn)讓系統(tǒng)調(diào)用onDraw方法，這里也是和surfaceview中的不同之一！
備注3
這里canvas.save();和canvas.restore();是兩個(gè)相互匹配出現(xiàn)的，作用是用來(lái)保存畫布的狀態(tài)和取出保存的狀態(tài)的。這里稍微解釋一下，
當(dāng)我們對(duì)畫布進(jìn)行旋轉(zhuǎn)，縮放，平移等操作的時(shí)候其實(shí)我們是想對(duì)特定的元素進(jìn)行操作，比如圖片，一個(gè)矩形等，但是當(dāng)你用canvas的方法來(lái)進(jìn)行這些操作的時(shí)候，其實(shí)是對(duì)整個(gè)畫布進(jìn)行了操作，那么之后在畫布上的元素都會(huì)受到影響，所以我們?cè)诓僮髦罢{(diào)用canvas.save()來(lái)保存畫布當(dāng)前的狀態(tài)，當(dāng)操作之后取出之前保存過的狀態(tài)，這樣就不會(huì)對(duì)其他的元素進(jìn)行影響
新聞名稱：Android讓游戲人物在屏幕上顯示
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