package com.amaker.test;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.RadioButton;import android.widget.Spinner;import android.widget.ToggleButton;public class MainActivity extends Activity {private Button register,cancel;private ToggleButton marriged;private RadioButton male,female;private EditText username,password;private Spinner position;private CheckBox reading,swimming;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);username = (EditText)findViewById(R.id.username);password = (EditText)findViewById(R.id.password);male = (RadioButton)findViewById(R.id.male);female = (RadioButton)findViewById(R.id.female);reading = (CheckBox)findViewById(R.id.reading);swimming = (CheckBox)findViewById(R.id.swimming);marriged = (ToggleButton)findViewById(R.id.marriged);position = (Spinner)findViewById(R.id.position);String str = {“CEO”,”CFO”,”PM”};ArrayAdapter aa = new ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item,str);position.setAdapter(aa);register = (Button)findViewById(R.id.register);cancel = (Button)findViewById(R.id.cancel);register.setOnClickListener(new OnClickListener {public void onClick(View v) {Bundle b = new Bundle;b.putString(“username”, “用户名称：”+username.getText.toString);b.putString(“password”, “用户密码：”+password.getText.toString);if(male.isChecked){b.putString(“gender”, “性别：男”);}else{b.putString(“gender”, “性别：女”);}String temp = “爱好：”;if(reading.isChecked){temp+=”阅读”;}if(swimming.isChecked){temp+=” “;temp+=”游泳”;}b.putString(“hobby”, temp);if(marriged.isChecked){b.putString(“marriged”, “婚否：已婚”);}else{b.putString(“marriged”, “婚否：未婚”);}b.putString(“position”,”职位：”+ position.getSelectedItem.toString);Intent intent = new Intent(MainActivity.this,ResultActivity.class);intent.putExtra(“data”, b);startActivity(intent);}。
Kotlin使用的布局中的控件id必须使用小驼峰方式, 例: android:id=”@+id/tvLogin”。
android:id属性为Button指定一个唯一标识符，我们在.java文件里获取布局文件里的元素时就需要这个属性。
public void onCreate(Bundle savedInstanceState) {23 super.onCreate(savedInstanceState);4 setContentView(R.layout.activity_main);5 edit1=(EditText)findViewById(R.id.editText1);6 b1=(Button)findViewById(R.id.button1);7 b2=(Button)findViewById(R.id.button2);8 b3=(Button)findViewById(R.id.button3);9 b4=(Button)findViewById(R.id.button4);10 b5=(Button)findViewById(R.id.button5);11 b6=(Button)findViewById(R.id.button6);12 b7=(Button)findViewById(R.id.button7);13 b8=(Button)findViewById(R.id.button8);1415 b1.setOnClickListener(listener);16 b2.setOnClickListener(listener);17 b3.setOnClickListener(listener);18 b4.setOnClickListener(listener);19 b5.setOnClickListener(listener);20 b6.setOnClickListener(listener);21 b7.setOnClickListener(listener);22 b8.setOnClickListener(listener);23242526 }2728 private Button.OnClickListener listener =new29 Button.OnClickListener {3031 @Override32 public void onClick(View v) {33 // TODO Auto-generated method stub34 switch (v.getId) {35 case R.id.button1:36 displayATM(“1”);37 break;38 case R.id.button2:39 displayATM(“2”);40 break;41 case R.id.button3:42 displayATM(“3”);43 break;44 case R.id.button4:45 displayATM(“4”);46 break;47 case R.id.button5:48 displayATM(“5”);49 break;50 case R.id.button6:51 displayATM(“6”);52 break;53 case R.id.button7:{54 String str=edit1.getText.toString;55 if (str.length>0){56 str=str.substring(0,str.length-1);57 edit1.setText(str);58 }59 }60 case R.id.button8:{61 String str=edit1.getText.toString;62 if (str.equals(“667788”)){63 Toast toast =Toast.makeText(MainActivity.this, “密码正确，欢迎使用提款功能”, Toast.LENGTH_LONG);64 toast.show;65 }66 else{67 Toast toast =Toast.makeText(MainActivity.this, “密码错误，请重新输入”, Toast.LENGTH_LONG);68 toast.show;69 }7071 }72 default:73 break;74 }75 }76 };77 private void displayATM(String s){78 String str=edit1.getText.toString;79 edit1.setText(str+s);80 }。
各个用户名id被定义在数组android_ids中，此数组表示了一个映射关系，能够将字符串和整数值对应起来。定义代码如下所示。
Android中所有的资源都有一个对应的资源ID，资源ID的类型为16进制的整数。有些时候特殊的场合处理资源ID，为了调试需要进行进制转换，比如16进制转常用的10进制。不用自己算，使用下面的工具就可以轻松搞定。
@Overridepublic void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 获取三个UI组件 start = (Button)findViewById(R.id.start); chronoText = (TextView)findViewById(R.id.chronoText); chronoValue = (EditText)findViewById(R.id.chronoValue); start.setOnClickListener(new OnClickListener { @Override public void onClick(View v) { // 获取EditText里的数值 int value = Integer.parseInt(String.valueOf(chronoValue.getText)); // 验证数值是否大于零 if (value > 0) { new Chronograph.execute(value); } else { Toast.makeText(AsyncTaskActivity.this, “请输入一个大于零的整数值 !”, Toast.LENGTH_LONG).show; } } });}如果我们在继承AsyncTask类时，对于三个参数中有不需要的，可以定义为Void类型（注意，与小写的 void 不同），例如：
package com.example.imooc_weixinfragment;import android.app.Activity;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.Window;import android.view.View.OnClickListener;import android.widget.ImageButton;import android.widget.LinearLayout;//我们使用的是android v4包下的fragment,这里必须要继承自FragmentActivity，而不是Activitypublic class MainActivity extends FragmentActivity implements OnClickListener{//底部的4个导航控件private LinearLayout mTabWeixin;private LinearLayout mTabFrd;private LinearLayout mTabAddress;private LinearLayout mTabSetting;//底部4个导航控件中的图片按钮private ImageButton mImgWeixin;private ImageButton mImgFrd;private ImageButton mImgAddress;private ImageButton mImgSetting;//初始化4个Fragmentprivate Fragment tab01;private Fragment tab02;private Fragment tab03;private Fragment tab04;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initView;//初始化所有的viewinitEvents;setSelect(0);//默认显示聊天界面}private void initEvents {mTabWeixin.setOnClickListener(this);mTabFrd.setOnClickListener(this);mTabAddress.setOnClickListener(this);mTabSetting.setOnClickListener(this);}private void initView {mTabWeixin = (LinearLayout)findViewById(R.id.id_tab_weixin);mTabFrd = (LinearLayout)findViewById(R.id.id_tab_frd);mTabAddress = (LinearLayout)findViewById(R.id.id_tab_address);mTabSetting = (LinearLayout)findViewById(R.id.id_tab_setting);mImgWeixin = (ImageButton)findViewById(R.id.id_tab_weixin_img);mImgFrd = (ImageButton)findViewById(R.id.id_tab_frd_img);mImgAddress = (ImageButton)findViewById(R.id.id_tab_address_img);mImgSetting = (ImageButton)findViewById(R.id.id_tab_setting_img);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater.inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId;if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}@Overridepublic void onClick(View v) {resetImg;switch (v.getId) {case R.id.id_tab_weixin://当点击按钮时，切换图片为亮色，切换fragment为聊天界面setSelect(0);break;case R.id.id_tab_frd:setSelect(1);break;case R.id.id_tab_address:setSelect(2);break;case R.id.id_tab_setting:setSelect(3);break;。
