android 2C学习

**本次的App做的是一个篮球记分
1.首先还是布局，先观察一个队，两个TextView，三个Button，是线性垂直布局。可以用LinearLayout。
2.将一个队整个看成一个View,一共两个队加一个分割线，线性水平布局。所以在外层套一个LInerLayout。
3.将两个队和分割线看成一个View,和最后的Reset Button可以用RelativeLayout，所以最外层是RelativeLayout。
4.至于其他的字体颜色调整，以及Button响应之前都做过，比较容易。**

//xml代码
<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout   xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.ydh.courtcounter.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_weight="1"
            android:layout_width="0dp"
            android:orientation="vertical"
            android:layout_height="wrap_content">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="26sp"
                android:gravity="center_horizontal"
                android:text="Team A" />
            <TextView
                android:layout_width="match_parent"
                android:id="@+id/Team_A"
                android:textSize="60sp"
                android:textColor="@android:color/black"
                android:text="0"
                android:gravity="center_horizontal"
                android:layout_height="wrap_content" />
            <Button
                android:text="+3points"
                android:layout_width="150dp"
                android:background="@android:color/holo_blue_bright"
                android:onClick="Team_A_3"
                android:layout_gravity="center_horizontal"
                android:layout_height="60dp" />
            <Button
                android:text="+2points"
                android:layout_width="150dp"
                android:layout_marginBottom="8dp"
                android:background="@android:color/holo_blue_bright"
                android:onClick="Team_A_2"
                android:layout_marginTop="8dp"
                android:layout_gravity="center_horizontal"
                android:layout_height="60dp" />
            <Button
                android:text="+1point"
                android:background="@android:color/holo_blue_bright"
                android:onClick="Team_A_1"
                android:layout_width="150dp"
                android:layout_gravity="center_horizontal"
                android:layout_height="60dp" />
        </LinearLayout>

        <View
            android:layout_width="1dp"
            android:background="@android:color/darker_gray"
            android:layout_height="315dp" ></View>

        <LinearLayout
            android:layout_weight="1"
            android:layout_width="0dp"
            android:orientation="vertical"
            android:layout_height="wrap_content">


            <TextView
                android:layout_width="match_parent"
                android:textSize="26sp"
                android:gravity="center_horizontal"
                android:layout_height="wrap_content"
                android:text="Team B" />
            <TextView
                android:layout_width="match_parent"
                android:textSize="60sp"
                android:id="@+id/Team_B"
                android:textColor="@android:color/black"
                android:text="0"
                android:gravity="center_horizontal"
                android:layout_height="wrap_content" />
            <Button
                android:text="+3points"
                android:layout_width="150dp"
                android:onClick="Team_B_3"
                android:background="@android:color/holo_blue_bright"
                android:layout_gravity="center_horizontal"
                android:layout_height="60dp" />
            <Button
                android:text="+2points"
                android:layout_gravity="center_horizontal"
                android:layout_marginBottom="8dp"
                android:onClick="Team_B_2"
                android:layout_marginTop="8dp"
                android:background="@android:color/holo_blue_bright"
                android:layout_width="150dp"
                android:layout_height="60dp" />
            <Button
                android:text="+1point"
                android:layout_width="150dp"
                android:onClick="Team_B_1"
                android:background="@android:color/holo_blue_bright"
                android:layout_gravity="center_horizontal"
                android:layout_height="60dp" />
        </LinearLayout>

    </LinearLayout>

    <Button
        android:layout_width="150dp"
        android:layout_alignParentBottom="true"
        android:textSize="20dp"
        android:layout_marginBottom="8dp"
        android:onClick="Reset"
        android:text="Reset"
        android:background="@android:color/holo_purple"
        android:layout_centerInParent="true"
        android:layout_height="60dp" />
</RelativeLayout>

//.java代码
package com.example.ydh.courtcounter;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    int A_score=0,B_score=0;
    public void Team_A_3(View v){
        A_score=A_score+3;
        displayA(A_score);
    }

    public void Team_A_2(View v){
        A_score=A_score+2;
        displayA(A_score);
    }

    public void Team_A_1(View v){
        A_score=A_score+1;
        displayA(A_score);
    }

    public void Team_B_3(View v){
        B_score=B_score+3;
        displayB(B_score);
    }

    public void Team_B_2(View v){
        B_score=B_score+2;
        displayB(B_score);
    }

    public void Team_B_1(View v){
        B_score=B_score+1;
        displayB(B_score);
    }

    public void Reset(View v){
        A_score=0;
        B_score=0;
        displayA(A_score);
        displayB(B_score);
    }

    public void displayA(int score){
        TextView scoreView = (TextView) findViewById(R.id.Team_A);
        scoreView.setText(String.valueOf(score));

    }

    public void displayB(int score){
        TextView scoreView = (TextView) findViewById(R.id.Team_B);
        scoreView.setText(String.valueOf(score));

    }
}