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)); } }