android编程举例4

1、表格布局：Main.xml<?xml version="1.0" encoding="utf-8"?> <TableLayout android:id="+id/TableLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="<TableRow android:id="+id/TableRow01" and

2、roid:layout_width="wrap_content" android:layout_height="wrap_content"><TextView android:id="+id/label" android:layout_height="wrap_content" android:layout_width="160dip"android:gravity="right" android:text="用户名：" android:pad

3、ding="3dip" ></TextView><EditText android:id="+id/entry" android:layout_height="wrap_content" android:layout_width="160dip"android:padding="3dip" ></EditText></TableRow><TableRow android:id="+id/TableRow02" and

4、roid:layout_width="wrap_content" android:layout_height="wrap_content"><Button android:id="+id/ok" android:layout_height="wrap_content" android:padding="3dip" android:text="确认"></Button><Button android:id="+id/Button02

5、" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="3dip" android:text="取消"></Button></TableRow></TableLayout> 功能描述：主界面上有一个“登录”按钮，点击“登录”按钮后打开一个新的Activity；新的Activity上面有输入用户名和密码的控件，在用户关闭这个Activity

6、后，将用户输入的用户名和密码传递到主界面中。 编程要点：主界面的Activity命名为MainActivity；启动新的Activity命名为UserLoginActivity；分别使用显示启动和隐式启动的方式，启动新的Activity；用户名中不能出现“”符号，同时长度不超过12个字符；密码使用密码文本显示方式，即显示为“*”，同时只能为数字； 返回的用户名和密码要以Toast的方式显示出来； MainActivity和UserLoginActivity中各个生命周期的回调函数中要以Log.i方式显示日志信息。两个布局xml代码类似上面的布局，故省略，自己模仿MainActivity.jav

7、apublic class MainActivity extends Activity protected int SUBACTIVITY1 = 1;/唯一标示子activity标识码private static String TAG = "MainActivity"/用来在运行时显示activity日志，即上面要求的第五条Button button1,button2;public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layo

8、ut.main);Log.i(TAG, "(1) onCreate()");/日志上显示onCreate（）button1 = (Button) this.findViewById(R.id.button1);button2 = (Button) this.findViewById(R.id.button2);button1.setOnClickListener(new View.OnClickListener() public void onClick(View v) Intent intent = new Intent(MainActivity.this,UserLog

9、inActivity.class);Toast.makeText(getApplicationContext(), "显示启动", Toast.LENGTH_SHORT).show();startActivityForResult(intent, SUBACTIVITY1); );button2.setOnClickListener(new View.OnClickListener()public void onClick(View v) Intent intent = new Intent("cn.test.nchu");Toast.makeText(

10、getApplicationContext(), "隐式启动", Toast.LENGTH_SHORT).show();startActivityForResult(intent, SUBACTIVITY1););protected void onActivityResult(int requestCode, int resultCode, Intent data) super.onActivityResult(requestCode, resultCode, data);if (resultCode = RESULT_OK) Uri uriData = data.getD

11、ata();Toast.makeText(getApplicationContext(), uriData.toString(),Toast.LENGTH_SHORT).show(); else Toast.makeText(getApplicationContext(), "用户名和密码为空", Toast.LENGTH_SHORT).show();/可视生命周期开始时被调用，对用户界面进行必要的更改 public void onStart() super.onStart(); Log.i(TAG, "(2) onStart()"); /在onStar

12、t()后被调用，用于恢复onSaveInstanceState()保存的用户界面信息 public void onRestoreInstanceState(Bundle savedInstanceState) super.onRestoreInstanceState(savedInstanceState); Log.i(TAG, "(3) onRestoreInstanceState()"); /在活动生命周期开始时被调用，恢复被onPause()停止的用于界面更新的资源 public void onResume() super.onResume(); Log.i(TAG,

13、 "(4) onResume()"); / 在onResume()后被调用，保存界面信息 public void onSaveInstanceState(Bundle savedInstanceState) super.onSaveInstanceState(savedInstanceState); Log.i(TAG, "(5) onSaveInstanceState()"); /在重新进入可视生命周期前被调用，载入界面所需要的更改信息 public void onRestart() super.onRestart(); Log.i(TAG, &quo

14、t;(6) onRestart()"); /在活动生命周期结束时被调用，用来保存持久的数据或释放占用的资源。 public void onPause() super.onPause(); Log.i(TAG, "(7) onPause()"); /在可视生命周期结束时被调用，一般用来保存持久的数据或释放占用的资源 public void onStop() super.onStop(); Log.i(TAG, "(8) onStop()"); /在完全生命周期结束时被调用，释放资源，包括线程、数据连接等 public void onDestroy

15、() super.onDestroy(); Log.i(TAG, "(9) onDestroy()"); UserLoginActivity.javapublic class UserLoginActivity extends Activity EditText username,password;Button submit,reset;private static String TAG = "MainActivity"protected void onCreate(Bundle savedInstanceState) / TODO Auto-gener

16、ated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.login); Log.i(TAG, "(1) onCreate()");username=(EditText)this.findViewById(R.id.username);password=(EditText)this.findViewById(R.id.password);submit=(Button)this.findViewById(R.id.submit);reset=(Button)this.findViewB

17、yId(R.id.reset);username.setFocusable(true);username.setOnKeyListener(new OnKeyListener()public boolean onKey(View v, int keyCode, KeyEvent event) / TODO Auto-generated method stubint unicodeChar = event.getUnicodeChar();if(unicodeChar= 64)return true;else return false;);submit.setOnClickListener(ne

18、w View.OnClickListener() public void onClick(View v) / TODO Auto-generated method stubString name =username.getText().toString();String pass=password.getText().toString();String uriString="用户名："+name+"密码："+pass; Uri data = Uri.parse(uriString); Intent result = new Intent(null, da

19、ta); setResult(RESULT_OK, result);finish(););reset.setOnClickListener(new View.OnClickListener() public void onClick(View v) / TODO Auto-generated method stubsetResult(RESULT_CANCELED, null);finish(););下面和MainActivity.java中的一样都是设置activity生命周期在log中显示AndroidManifest.xml<?xml version="1.0"

20、 encoding="utf-8"?><manifest xmlns:android=" package="cn.test.nchu" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="8" /> <application android:icon="drawable/icon" android:label=&qu

21、ot;string/app_name"> <activity android:name=".MainActivity" android:label="string/app_name"> <intent-filter> <action android:name="ent.action.MAIN" /> <category android:name="ent.category.LAUNCHER" /> </

22、intent-filter> </activity><activity android:name="cn.test.nchu.UserLoginActivity" >/显式启动要加的activity <intent-filter> <action android:name="cn.test.nchu" />/隐式启动，名字和MainActivity.java中的隐式启动里的名字一样 <category android:name="ent.category.DEFA

23、ULT" /> </intent-filter> </activity> </application></manifest>编程建立一个简单的进程内服务，实现比较两个整数大小的功能。服务提供IntCompare(Int, Int)函数，输入两个整数，输出较大的整数。 主界面的Activity命名为MainActivity；提供两个EditText，分别输入两个整数；提供一个Botton，启动比较过程；提供一个TextView，显示较大的整数；分别使用启动方式和绑定方式使用Service；分别使用Handle和AsyncTask更新

24、TextView中的内容。启动方式MainActivity.javapublic class MainActivity extends Activity public static int maxNum;public static Handler handler=new Handler();private static TextView result=null;private static Button compare=null;private static Button reset=null;private static EditText one=null;private static Ed

25、itText two=null;public static void UpdateGUI(int refreshDouble)maxNum=refreshDouble;handler.post(RefreshLable); private static Runnable RefreshLable=new Runnable()public void run() result.setText(String.valueOf(maxNum); public void onCreate(Bundle savedInstanceState) final Bundle mybundle=new Bundle

26、(); super.onCreate(savedInstanceState); setContentView(R.layout.main); final Intent intent=new Intent(MainActivity.this,CompareService.class); result=(EditText)findViewById(R.id.result); compare=(Button)findViewById(Rpare); reset=(Button)findViewById(R.id.reset); one=(EditText)findViewById(R.id.one)

27、; two=(EditText)findViewById(R.id.two); compare.setOnClickListener(new OnClickListener() public void onClick(View v) mybundle.putString("one", one.getText().toString(); mybundle.putString("two", two.getText().toString(); intent.putExtras(mybundle); startService(intent); ); reset.

28、setOnClickListener(new OnClickListener() public void onClick(View v) one.setText(null); two.setText(null); result.setText(null); ); CompareService.javapublic class CompareService extends Service private Thread workThread;Bundle bundle=null;int one=0,two=0;public void onCreate() super.onCreate(); wor

29、kThread = new Thread(null,backgroudWork,"WorkThread");public void onStart(Intent intent, int startId) super.onStart(intent, startId); bundle=intent.getExtras(); String c1=bundle.getString("one"); String c2=bundle.getString("two"); if(!c1.toString().equals("")&

30、amp;&!c2.toString().equals("") one=Integer.parseInt(c1); two=Integer.parseInt(c2); if (!workThread.isAlive() workThread.start(); public IBinder onBind(Intent intent) return null;private Runnable backgroudWork = new Runnable()public void run() int randomDouble =IntCompare(one,two);MainA

31、ctivity.UpdateGUI(randomDouble);stopSelf();int IntCompare(int a,int b)if(a>=b)return a;elsereturn b;这样并没有完，还要在AndroidManifest.xml中加入service名字，如<application 。（和前面的AndroidManifest.xml代码相同） <service android:name=".CompareService" ></service></application>绑定启动MainActivi

32、ty.Javapublic class MainActivity extends Activity private boolean isBound = false;private CompareService compareService;int a=0,b=0; public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); final TextView result=(TextView)findViewById(R.id.re

33、sult); Button compare=(Button)findViewById(Rpare); Button reset=(Button)findViewById(R.id.reset); final EditText one=(EditText)findViewById(R.id.one); final EditText two=(EditText)findViewById(R.id.two); if(!isBound)Intent serviceIntent=new Intent(MainActivity.this,CompareService.class);bindService(serviceIntent,mConnection,Context.BIND_AUTO_CREATE);isBound=true; compare.setOnClickListener(new OnClickList