Android LCD

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import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public   class TestColor extends Activity{
    private   static   final String TAG = "TestColor" ;

    private Button mReturn = null ;
    private Button mChangeColor = null ;
    private Button mNext = null ;
    private TextView mText1 = null ;
    private TextView mText2 = null ;
    private TextView mText3 = null ;
    private Intent mIntent = null ;

    private   int mNum = 0 ;

    protected   void onCreate(Bundle savedInstanceState)
    {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.test_color);
        initView();
    }

    private   void initView()
    {
        setTitle(R.string.test_color_mess);
        mReturn = (Button)findViewById(R.id.but_return);
        mChangeColor = (Button)findViewById(R.id.but_changecolor);
        mNext = (Button)findViewById(R.id.but_next);

        mText1 = (TextView)findViewById(R.id.test_color_text1);
        mText2 = (TextView)findViewById(R.id.test_color_text2);
        mText3 = (TextView)findViewById(R.id.test_color_text3);

        mReturn.setOnClickListener(new View.OnClickListener()
        {
            public   void onClick(View v)
            {
                mIntent = new Intent(TestColor. this , MainActivity. class );
                startActivity(mIntent);
            }
        });

        mNext.setOnClickListener(new View.OnClickListener()
        {
            public   void onClick(View v)
            {
                mIntent = new Intent(TestColor. this , TestSd. class );
                //mIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                finish();
                startActivity(mIntent);
            }
        });
        mChangeColor.setOnClickListener(new View.OnClickListener()
        {
            public   void onClick(View v)
            {
                mNum ++;
                changeColor(mNum);
            }
        });
    }

    private   void changeColor( int num)
    {
        Log.e(TAG, "num = " + (num% 6 ));
        switch (num % 6 )
        {
        case   0 :
            mText1.setBackgroundColor(Color.RED);
            mText2.setBackgroundColor(Color.RED);
            mText3.setBackgroundColor(Color.RED);
            break ;
        case   1 :
            mText1.setBackgroundColor(Color.GREEN);
            mText2.setBackgroundColor(Color.GREEN);
            mText3.setBackgroundColor(Color.GREEN);
            break ;
        case   2 :
            mText1.setBackgroundColor(Color.BLUE);
            mText2.setBackgroundColor(Color.BLUE);
            mText3.setBackgroundColor(Color.BLUE);
            break ;
        case   3 :
            mText1.setBackgroundColor(Color.RED);
            mText2.setBackgroundColor(Color.RED);
            mText3.setBackgroundColor(Color.RED);
            break ;
        case   4 :
            mText1.setBackgroundColor(Color.GREEN);
            mText2.setBackgroundColor(Color.GREEN);
            mText3.setBackgroundColor(Color.GREEN);
            break ;
        case   5 :
            mText1.setBackgroundColor(Color.BLUE);
            mText2.setBackgroundColor(Color.BLUE);
            mText3.setBackgroundColor(Color.BLUE);
            break ;
        }
    }

XML文件：

<?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:background="#383838"
    android:orientation="vertical"
    android:gravity="center"     >

     <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" >

        <TextView android:id="@+id/test_color_text1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="#ffff0000" />
        <TextView android:id="@+id/test_color_text2"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="#ffff0000" />
        <TextView android:id="@+id/test_color_text3"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="#ffff0000" />

    </LinearLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:gravity="center" >

        <Button android:id="@+id/but_return"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:text="@string/but_return" />

        <Button android:id="@+id/but_changecolor"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:text="@string/but_changecolor" />

        <Button android:id="@+id/but_next"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="20dp"
            android:text="@string/but_next" />
    </LinearLayout>
</LinearLayout>