刘影-作业乘法表文档.doc

作业乘法表第一种方法：MainActivity.java文件代码如下：package com.example.tables;import android.app.Activity;import android.app.ActionBar;import android.app.Fragment;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.TableLayout;import android.widget.Toast;import android.os.Build;public class MainActivity extends Activity /* * 通过控制两个子表格布局的显示与隐藏来实现乘法表左右边显示的切换 */ / 左边显示的切换按钮 private Button LeftButton; /右边显示的切换按钮 private Button RightButton; / 左边显示内容的表格布局 private TableLayout LeftTable; / 右边显示内容的表格布局 private TableLayout RightTable; / 更新左边UI的Hnadler Handler lhandler = new Handler() Override public void handleMessage(Message msg) / 左边的表格显示 LeftTable.setVisibility(View.VISIBLE); /右边的表格隐藏 RightTable.setVisibility(View.GONE); ; / 更新右边UI的Hnadler Handler rhandler = new Handler() Override public void handleMessage(Message msg) /左边的表格隐藏 LeftTable.setVisibility(View.GONE); / 右边的表格显示 RightTable.setVisibility(View.VISIBLE); ; Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); / 初始化控件 init(); /初始化事件监听 initEvent(); /* * 初始化界面中的控件 包括两个切换乘法表显示方式的按钮和两个子布局控件 */ public void init() LeftButton = (Button) findViewById(R.id.leftbutton); RightButton = (Button) findViewById(R.id.rightbutton); LeftTable = (TableLayout) findViewById(R.id.left); RightTable = (TableLayout) findViewById(R.id.right); /* * 给左边右边两个按钮添加监听器和设置触发事件 */ public void initEvent() LeftButton.setOnClickListener(new OnClickListener() Override public void onClick(View arg0) / 通过hangdler更新UI lhandler.sendEmptyMessage(0x101); ); RightButton.setOnClickListener(new OnClickListener() Override public void onClick(View arg0) / 通过hangdler更新UI rhandler.sendEmptyMessage(0x101); ); Activity_main.xml文件代码如下：LinearLayout xmlns:android=/apk/res/android xmlns:tools=/tools android:layout_width=match_parent android:layout_height=match_parent android:orientation=vertical android:background=#000 tools:context=com.example.tables.MainActivity$PlaceholderFragment 运行结果如下图所示： 第二种方法：MainActivity.java文件代码如下：package com.example.tables2;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.Gravity;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout;public class MainActivity extends Activity /* * 采用线性布局来放置乘法表，通过动态控制现形布局的排列方式来实现乘法表的左右显示的切换 */ / 左边排列按钮 private Button leftButton; / 右边排列按钮 private Button rightButton; /显示乘法表第一行的子线性布局 private LinearLayout row1; /显示乘法表第二行的子线性布局 private LinearLayout row2; /显示乘法表第三行的子线性布局 private LinearLayout row3; /显示乘法表第四行的子线性布局 private LinearLayout row4; Handler lhandler = new Handler() Override public void handleMessage(Message msg) / 控制子线性控件居左显示 row1.setGravity(Gravity.LEFT); row2.setGravity(Gravity.LEFT); row3.setGravity(Gravity.LEFT); row4.setGravity(Gravity.LEFT); ;Handler rhandler = new Handler() Override public void handleMessage(Message msg) / 控制子线性控件居右显示 row1.setGravity(Gravity.RIGHT); row2.setGravity(Gravity.RIGHT); row3.setGravity(Gravity.RIGHT); row4.setGravity(Gravity.RIGHT); ; Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); / 初始化UI控件 init(); / 初始化事件监听 initEvent(); /* * 初始化各个控件 包括两个按钮 四个子线性布局控件 */ public void init() leftButton = (Button) findViewById(R.id.leftbut); rightButton = (Button) findViewById(R.id.rightbut); row1 = (LinearLayout) findViewById(R.id.row1); row2 = (LinearLayout) findViewById(R.id.row2); row3 = (LinearLayout) findViewById(R.id.row3); row4 = (LinearLayout) findViewById(R.id.row4); /* * 设置事件监听器 并且对应相应的触发事件 */ public void initEvent() leftButton.setOnClickListener(new OnClickListener() Override public void onClick(View arg0) / 左边按钮的触发事件 通过Handler更新UI lhandler.sendEmptyMess