在android中随机播放数组图像答案

【问题标题】：Shuffle Array images in android在android中随机播放数组图像
【发布时间】：2014-03-12 10:04:14
【问题描述】：

我正在开发一个 Android 应用程序，我需要在分配给适配器之前使用随机函数对存储在数组中的图像进行洗牌。我有以下关于如何洗牌数组图像的代码，但遇到错误

MainActivity.java：

public class MainActivity extends Activity {
    Context ctx;
    boolean flage=false;
    int img1=-1,img2=-1;
    public int OriginalArray[] = { R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3 };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        shuffleArray();
        final GridView grid = (GridView) findViewById(R.id.gv_memory);
        grid.setAdapter(new GridViewContent(this));
    }
    private void shuffleArray() {
        // TODO Auto-generated method stub
        Random arrayRandom= new Random();
        for(int i=0; i<OriginalArray.length-1; i++){
            int index=arrayRandom.nextInt(i);
            OriginalArray[i]=OriginalArray[index];

        }

    }
    public class GridViewContent extends BaseAdapter {
        private Context context;

        public int pictureArray[]={
                R.drawable.question,
                R.drawable.question,
                R.drawable.question,
                R.drawable.question,
                R.drawable.question,
                R.drawable.question,
                R.drawable.question,
                R.drawable.question,        
        };
        public GridViewContent(Context c){
            context=c;

        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return (pictureArray.length);
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return pictureArray[position];
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(final int position, View arg1, ViewGroup arg2) {
            // TODO Auto-generated method stub
            final ImageView myimage=new ImageView(context);
            myimage.setImageResource(pictureArray[position]);
            myimage.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
            myimage.setLayoutParams(new GridView.LayoutParams(70, 70));
            myimage.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    //Toast.makeText(context, String.valueOf(position), Toast.LENGTH_SHORT).show();
                myimage.setImageResource(OriginalArray[position]);

                if(flage==false)
                {

                img1=OriginalArray[position];

                flage=true;

                }else if(flage==true){

                img2=OriginalArray[position];
                checkResult();
                flage=false;
                }
                //else if(f)
                }
            });

            return myimage;
        }

    }
    public void checkResult() {
        if(img1==img2)
        {
            Toast.makeText(MainActivity.this, "Congratualatin !!!!", Toast.LENGTH_LONG).show();
        }
        else{
            Toast.makeText(MainActivity.this, "Sorry!!!!", Toast.LENGTH_LONG).show();
            final GridView grid = (GridView) findViewById(R.id.gv_memory);
            grid.setAdapter(new GridViewContent(this));
        }

    }
}

LogCat……

03-12 05:40:31.904: D/dalvikvm(1081): GC_FOR_ALLOC freed 58K, 8% free 2771K/3000K, paused 198ms, total 201ms
03-12 05:40:31.914: I/dalvikvm-heap(1081): Grow heap (frag case) to 3.943MB for 1127536-byte allocation
03-12 05:40:31.965: D/dalvikvm(1081): GC_FOR_ALLOC freed 2K, 6% free 3870K/4104K, paused 47ms, total 47ms
03-12 05:40:32.014: D/AndroidRuntime(1081): Shutting down VM
03-12 05:40:32.014: W/dalvikvm(1081): threadid=1: thread exiting with uncaught exception (group=0x41465700)
03-12 05:40:32.024: E/AndroidRuntime(1081): FATAL EXCEPTION: main
03-12 05:40:32.024: E/AndroidRuntime(1081): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.memoryforkids/com.example.memoryforkids.MainActivity}: java.lang.IllegalArgumentException: n <= 0: 0
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.os.Looper.loop(Looper.java:137)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.ActivityThread.main(ActivityThread.java:5103)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at java.lang.reflect.Method.invokeNative(Native Method)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at java.lang.reflect.Method.invoke(Method.java:525)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at dalvik.system.NativeStart.main(Native Method)
03-12 05:40:32.024: E/AndroidRuntime(1081): Caused by: java.lang.IllegalArgumentException: n <= 0: 0
03-12 05:40:32.024: E/AndroidRuntime(1081):     at java.util.Random.nextInt(Random.java:175)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at com.example.memoryforkids.MainActivity.shuffArray(MainActivity.java:47)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at com.example.memoryforkids.MainActivity.onCreate(MainActivity.java:38)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.Activity.performCreate(Activity.java:5133)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-12 05:40:32.024: E/AndroidRuntime(1081):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
03-12 05:40:32.024: E/AndroidRuntime(1081):     ... 11 more

【问题讨论】：

您在 Array 中使用相同的可绘制对象，为什么要改组？？
查看 Collections.shuffle
@kalyanpvs：实际上我将此代码用于儿童游戏，我希望每次图像位置都改变..
ok..代替数组使用 ArrayList 和 Collections.shuffle 来随机播放数据..
@kalyanpvs：先生，如果你给我一个示例代码，我将非常感谢你......

标签： android gridview random

【解决方案1】：

首先你需要将你的数组转换成arraylist，然后你可以在上面应用Collection.shuffle()。

以下几行将您的int 图片数组转换为Integer 的数组列表。

List<Integer> pictures = new ArrayList<Integer>();
for (int index = 0; index < OriginalArray.length; index++)
{
    pictures.add(OriginalArray[index]);
}

然后使用Collection.shuffle()就可以了。

Collections.shuffle(pictures);

现在在您的getView 方法中，您可以通过以下方式使用它。

myimage.setImageResource(pictures.get(position));

【讨论】：