0

私は Android にかなり慣れていないので、画像の読み込みに問題があります。私の現在のコードは次のようになります。

package com.android.skeleton;

import java.io.IOException;
import java.io.InputStream;
import java.util.Random;

import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.media.SoundPool;

public class GameModel extends Game {
    private Bitmap background;
    private Bitmap gameover;
    public final int PLAYER = 0;
    public final int ENEMY = 1;
    public final int EXIT = 2;
    public final int BIGENEMY = 3;

    private int health;

    Sprite player;
    Enemy enemy1;
    Enemy enemy2;
    BigEnemy enemy3;
    Enemy enemy4;
    Enemy enemy5;
    Enemy enemy6;
    Exit exit;

    //Images
    Bitmap cat;
    Bitmap jellyfish;
    Bitmap bigdog;
    Bitmap exitTile;

    SoundPool music;
    SoundPool damageSound;

    Context context;
    InputStream inputStream = null;

    private static GameModel gameModel = null;
    public static GameModel getGameModel(){
        if(gameModel == null){
            gameModel = new GameModel();
        }
        return gameModel;
    }
    private GameModel(){

    }

    public void update(){

    }

    public void draw(Canvas canvas){

    }

    public boolean processTouchEvent(int x, int y){
        return false;
    }
    @Override
    public void gameStart() {
        // TODO Auto-generated method stub

         try{
                AssetManager assetManager = context.getAssets();
                inputStream = assetManager.open("/resources/blackcat.png");
                cat = BitmapFactory.decodeStream(inputStream);
                inputStream.close();

                inputStream = assetManager.open("/resources/Jellyfish1.png");
                jellyfish = BitmapFactory.decodeStream(inputStream);
                inputStream.close();

                inputStream = assetManager.open("/resources/Dog.png");
                bigdog = BitmapFactory.decodeStream(inputStream);
                inputStream.close();

                inputStream = assetManager.open("/resources/exit.png");
                exitTile = BitmapFactory.decodeStream(inputStream);
                inputStream.close();

                inputStream = assetManager.open("/resources/kitchen.png");
                background = BitmapFactory.decodeStream(inputStream);
                inputStream.close();

                inputStream = assetManager.open("/resources/endscreen.png");
                gameover = BitmapFactory.decodeStream(inputStream);
                inputStream.close();
                }catch(IOException ex){}

         gameSetBackground(background);

        player = new Sprite(cat, 0);
        enemy1 = new Enemy(jellyfish, 0);
        enemy2 = new Enemy(jellyfish, 0);
        enemy4 = new Enemy(jellyfish, 0);
        enemy5 = new Enemy(jellyfish, 0);
        enemy6 = new Enemy(jellyfish, 0);
        enemy3 = new BigEnemy(bigdog, 1.4);
        exit = new Exit (exitTile, 0);

        player.setLocation(320, 480);
        player.setType(0);
        player.setActive();
        health = 10;

        enemy1.setLocation(0, 160);
        enemy1.setVelocity(5, 0);
        enemy1.setType(1);
        enemy1.setActive();

        enemy2.setLocation(640, 320);
        enemy2.setVelocity(-5, 0);
        enemy2.setType(1);
        enemy2.setActive();

        Random random = new Random();
        Random random2 = new Random();
        int i = Math.abs(random.nextInt() % 10);
        int j = Math.abs(random2.nextInt() % 10);

        while (i < 2){
            i = Math.abs(random.nextInt() % 10);
        }
        while (j < 2){
            j = Math.abs(random.nextInt() % 10);
        }

        enemy4.setLocation(640, 0);
        enemy4.setVelocity(-i, j);
        enemy4.setType(1);
        enemy4.setActive();

        Random random3 = new Random();
        Random random4 = new Random();
        int k = Math.abs(random3.nextInt() % 10);
        int l = Math.abs(random4.nextInt() % 10);

        while (k < 2){
            k = Math.abs(random.nextInt() % 10);
        }
        while (l < 2){
            l = Math.abs(random.nextInt() % 10);
        }

        enemy5.setLocation(0, 480);
        enemy5.setVelocity(k, l);
        enemy5.setType(1);
        enemy5.setActive();

        enemy6.setLocation(600, 440);
        enemy6.setVelocity(0, -5);
        enemy6.setType(1);
        enemy6.setActive();

        exit.setLocation(600, 0);
        exit.setVelocity(0, 0);
        exit.setType(2);
        exit.setActive();

        //Add sprites to game
        gameAddSprite(player);
        gameAddSprite(enemy1);
        gameAddSprite(enemy2);
        gameAddSprite(enemy3);
        gameAddSprite(enemy4);
        gameAddSprite(enemy5);
        gameAddSprite(enemy6);
        gameAddSprite(exit);

    }
    @Override
    public void gameEnd() {
        // TODO Auto-generated method stub
        player.setInactive();
        enemy1.setInactive();
        enemy2.setInactive();
        enemy3.setInactive();
        enemy4.setInactive();
        enemy5.setInactive();
        enemy6.setInactive();
        exit.setInactive();
        gameSetBackground(gameover);

    }
    @Override
    public void gameUpdate(Canvas canvas) {
        // TODO Auto-generated method stub
        player.update();

        enemy1.rotate(0.1);
        enemy1.update();

        enemy2.rotate(0.1);
        enemy2.update();

        enemy3.update();

        enemy4.rotate(0.1);
        enemy4.update();

        enemy5.rotate(0.1);
        enemy5.update();

        enemy6.rotate(0.2);
        enemy6.update();

        if(enemy3.getPosy() == 430){
            enemy3.setInactive();
        }

        if(health == 0){
            gameEnd();
        }
    }
    @Override
    public void spriteCollide(Sprite s1, Sprite s2) {
        // TODO Auto-generated method stub

        if(s2.getType() == ENEMY && s1.getType() == PLAYER)
        {
            health -= 1;
        }
        if(s2.getType() == BIGENEMY && s1.getType() == PLAYER)
        {
            health -= 1;
        }
        if (s2.getType() == EXIT && s1.getType() == PLAYER)
        {
            gameEnd();
        }
        if(s2.getType() == ENEMY && s1.getType() == ENEMY)
        {
            double i = s2.getVelx();
            double j = s2.getVely();
            double k = s1.getVelx();
            double l = s1.getVely();
            s2.setVelocity(-i, -j);
            s1.setVelocity(-k,-l);
        }
    }

    public void actionPerformed() {
        // TODO Auto-generated method stub

            //Create random spawn positions for bigdogs
            Random random = new Random();
            Random random2 = new Random();
            int xPos = Math.abs(random.nextInt() % 640);
            int yVel = Math.abs(random2.nextInt() % 20);

            //Make sure y velocity is between 10 and 30. Set this way for now
            //to hide problems with individual enemy3 sprites becoming inactive.
            while (yVel < 10)
                yVel = Math.abs(random.nextInt() % 30);

            //Spawn big dogs with random x position and y velocity
            //according to timer settings.
                enemy3.setLocation(xPos, 0);
                enemy3.setActive();
                enemy3.setVelocity(0, -yVel);
                enemy3.setType(3);

    }
@Override
public void gameCheckInputs() {
    // TODO Auto-generated method stub

}

}

私はおそらく愚かなことをしていることを認識しており、おそらく非常に迅速な修正になるでしょう.

完全なコードで更新

ログファイルは次のとおりです。

04-30 03:49:19.490: W/dalvikvm(749): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
04-30 03:49:19.560: E/AndroidRuntime(749): FATAL EXCEPTION: main
04-30 03:49:19.560: E/AndroidRuntime(749): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.skeleton/com.android.skeleton.Android_SkeletonActivity}: java.lang.NullPointerException
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.os.Looper.loop(Looper.java:137)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.ActivityThread.main(ActivityThread.java:4424)
04-30 03:49:19.560: E/AndroidRuntime(749):  at java.lang.reflect.Method.invokeNative(Native Method)
04-30 03:49:19.560: E/AndroidRuntime(749):  at java.lang.reflect.Method.invoke(Method.java:511)
04-30 03:49:19.560: E/AndroidRuntime(749):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-30 03:49:19.560: E/AndroidRuntime(749):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-30 03:49:19.560: E/AndroidRuntime(749):  at dalvik.system.NativeStart.main(Native Method)
04-30 03:49:19.560: E/AndroidRuntime(749): Caused by: java.lang.NullPointerException
04-30 03:49:19.560: E/AndroidRuntime(749):  at com.android.skeleton.Game.gameSetBackground(Game.java:61)
04-30 03:49:19.560: E/AndroidRuntime(749):  at com.android.skeleton.GameModel.gameStart(GameModel.java:98)
04-30 03:49:19.560: E/AndroidRuntime(749):  at com.android.skeleton.GameSurfaceView.<init>(GameSurfaceView.java:23)
04-30 03:49:19.560: E/AndroidRuntime(749):  at com.android.skeleton.Android_SkeletonActivity.onCreate(Android_SkeletonActivity.java:18)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.Activity.performCreate(Activity.java:4465)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-30 03:49:19.560: E/AndroidRuntime(749):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

これがgameSetBackgroundです

public void gameSetBackground(Bitmap i){
        backgroundImage = i;
        if (clearList == null){
            clearList = new LinkedList<Rect>(); }
        clearList.add(new Rect(0, 0, canvas.getWidth(), canvas.getHeight()));
    }

ここに Game.java があります

package com.android.skeleton;

import java.util.LinkedList;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.Log;
import android.view.SurfaceHolder;


public abstract class Game implements Runnable {

    private LinkedList<Sprite> spriteList;

    public LinkedList<Sprite> sprites(){
        return spriteList;
    }
    private LinkedList<Rect>clearList;
    private Thread gameThread;
    private Bitmap backgroundImage=null;
    Canvas canvas;
    SurfaceHolder surfaceHolder = null;
    Canvas backGraphics;

    public abstract void gameStart();

    public abstract void gameEnd();

    public abstract void gameUpdate(Canvas c);

    public abstract void spriteCollide(Sprite s1, Sprite s2);

    public void init(){
        spriteList = new LinkedList<Sprite>();
        clearList = new LinkedList<Rect>();
        canvas = new Canvas();
    }

    public void setDebugOn(){
        for(Sprite s: spriteList)
            s.showRectangle();
    }
    public void setDebugOff(){
        for(Sprite s: spriteList)
            s.hideRectangle();
    }

    public void gameAddSprite(Sprite s){
        spriteList.add(s);
    }

    public void gameAddSprites(Sprite []slist){
        for(Sprite sp: slist)
            spriteList.add(sp);
    }

    public void gameSetBackground(Bitmap i){
        backgroundImage = i;
        if (clearList == null){
            clearList = new LinkedList<Rect>(); }
        clearList.add(new Rect(0, 0, canvas.getWidth(), canvas.getHeight()));
    }

    public void start(){
        gameThread  = new Thread(this);
        gameThread.start();
        gameStart();
    }

    public void stop(){
        gameEnd();
        gameThread = null;
    }

    public void update(Canvas canvas){
        for(Sprite s: spriteList){
            if(s.needsCleared()){

        }
        gameUpdate(backGraphics);
        paint(canvas);}
    }

    public void paint(Canvas canvas){
        if(backgroundImage != null) {
            for(Rect r: clearList){
                backGraphics.drawBitmap(backgroundImage, 
                                       r.left, r.top, null);
            }
        } else {
            for(@SuppressWarnings("unused") Rect r: clearList){
            }
        }
        clearList.clear();
        int n = spriteList.size();
        for(int i=n-1; i>=0; i--){
            spriteList.get(i).draw(backGraphics);
        }
    }

    public void run() {
        while(gameThread == Thread.currentThread()){
            if(surfaceHolder.getSurface().isValid()){
                canvas = new Canvas();
            canvas = surfaceHolder.lockCanvas();
            gameCheckInputs();
            checkCollisions();
            paint(canvas);
            try{
                Thread.sleep(40);
            }
            catch(InterruptedException ex){
                ex.printStackTrace();
            }
        }
            surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }

    private void checkCollisions(){
        if(spriteList.size() > 1){
            int nsprites = spriteList.size();
            for(int i=0; i<nsprites; i++) if(spriteList.get(i).isActive()){
                for(int j = i+1; j<nsprites; j++) if(spriteList.get(j).isActive()){
                    if(spriteList.get(i).getRect().intersect(spriteList.get(j).getRect())){
                        spriteCollide(spriteList.get(i), spriteList.get(j));
                    }
                }
            }
        }           
    }

    public void gameCheckInputs() {
        // TODO Auto-generated method stub

    }

    public void gameStart(Context context) {
        // TODO Auto-generated method stub

    }
}
4

4 に答える 4

1

こんにちはニュートリッター、あなたが本当に何をしようとしているのか知っているかもしれません

public void gameSetBackground(Bitmap i){
    backgroundImage = i;
    if (clearList == null){
        clearList = new LinkedList<Rect>(); }
    clearList.add(new Rect(0, 0, canvas.getWidth(), canvas.getHeight()));
}

backgroundImageAm i right or notを使用してい ませんか?

これを試して -

if(backgroundImage!=null)

あなたのコードの残りの部分..

于 2012-04-30T05:33:39.333 に答える
0

私はあなたのコードをフォローするのに苦労していますが、少なくともあなたの例外を修正するために私が見る1つの問題は、getWidth()おそらくキャンバスが描画される前にキャンバスを呼び出していることです。アクティビティのonCreate()方法では、アクティビティはまだ画面に描画されていないため、のキャンバスを操作するのに適したタイミングではありませんView。私が確実に知ることができる最善のアドバイスはSurfaceView、メソッドを拡張してオーバーライドしてから、XMLレイアウトで、などの完全に数量化された名前でonDraw()カスタムを使用することです。SurfaceView<com.android.skeleton.MySurfaceView />

例えば：

public class MySurfaceView extends SurfaceView {

    public MySurfaceView(Context context) {
        this(context, null, 0);
    }

    public MySurfaceView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MySurfaceView(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);
        // Draw some stuff
    }
}

XMLでレイアウトを拡張する場合は、次のようなカスタムビューを使用します。

<com.mypackage.MySurfaceView
    ...
/>
于 2012-04-30T18:58:14.623 に答える
0

基本的に私が間違っていたのは、Game.java クラス内で Init を呼び出していなかったことです。

if (clearList == null){
        clearList = new LinkedList<Rect>(); }

空白の画面しか表示されないという問題がありますが、この問題について新しい質問をする方が良いと思いますが、ご協力ありがとうございます!

于 2012-05-01T04:42:48.687 に答える
0

画像を assets/resources フォルダーではなく assets フォルダーに入れ、以下のコードを使用して画像を取得します。

try {
    InputStream bitmap=getAssets().open("icon.png");
    Bitmap bit=BitmapFactory.decodeStream(bitmap);

} catch (IOException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
}
于 2012-04-30T04:51:19.093 に答える