011.紅心A，HeartsA

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#808080"
    android:orientation="vertical"
    tools:context="${relativePackage}.${activityClass}" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="5dp"
        android:text="@string/hello_world"
        android:textSize="30sp" />

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:stretchColumns="*" >

        <TableRow
            android:id="@+id/tableRow1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/imageView1"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:onClick="onClick"
                android:src="@drawable/p0" />

            <ImageView
                android:id="@+id/imageView2"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:onClick="onClick"
                android:src="@drawable/p0" />
        </TableRow>

        <TableRow
            android:id="@+id/tableRow2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/imageView3"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:onClick="onClick"
                android:src="@drawable/p0" />

            <ImageView
                android:id="@+id/imageView4"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:onClick="onClick"
                android:src="@drawable/p0" />
        </TableRow>
    </TableLayout>

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:enabled="false"
        android:onClick="playAgain"
        android:text="開始遊戲" />

</LinearLayout>

package com.example.app11;

import android.app.Activity;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

    ImageView[] imageViews = new ImageView[4];
    Resources res;
    int[] imageRandom = new int[4];
    int[] imageIds = { R.drawable.p1, R.drawable.p2, R.drawable.p3,
            R.drawable.p4, };
    Button btnPlayAgain;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnPlayAgain = (Button) findViewById(R.id.button1);

        res = this.getResources();
        for (int i = 0; i < imageViews.length; i++) {
            int id = res.getIdentifier("imageView" + (i + 1), "id", this.getPackageName());
            imageViews[i] = (ImageView) this.findViewById(id);
        }

        startGame();

    }

    private void startGame() {
        // TODO Auto-generated method stub
        for (int i = 0; i < 4; i++) {
            imageViews[i].setImageResource(R.drawable.p0);
            imageViews[i].setClickable(true);
            imageViews[i].setAlpha(255);
        }

        boolean[] flag = new boolean[4];// 四個狀態預設為false
        for (int i = 0; i < 4;) {
            int tmp = (int) (Math.random() * 4);// 0~3
            if (flag[tmp] == false) {// 沒抓過
                flag[tmp] = true;
                imageRandom[i] = tmp;

                if (tmp == 0) { // 如果是紅心A
                    imageViews[i].setTag("Yes");
                } else {
                    imageViews[i].setTag("No");
                }

                i++;
            }
        }
    }

    public void onClick(View view) {
        // ((ImageView)view).setImageResource(R.drawable.p1);

        if ("Yes".equals(view.getTag())) {
            Toast.makeText(this, "你猜對了", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "你猜錯了", Toast.LENGTH_SHORT).show();
        }

        for (int i = 0; i < 4; i++) {
            imageViews[i].setImageResource(imageIds[imageRandom[i]]);
            imageViews[i].setClickable(false);
            if ("Yes".equals(imageViews[i].getTag())) {// 紅心A
                imageViews[i].setAlpha(255);
            } else {
                imageViews[i].setAlpha(128);
            }
        }
        btnPlayAgain.setEnabled(true);
    }

    public void playAgain(View view) {
        startGame();
    }
}

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