轉載請註明出處:http://blog.csdn.net/u011569040/article/details/45950737
點擊按鈕Start activity,啓動一個界面
點擊按鈕Start service,啓動一個Service,循環打印:
點擊按鈕stop service,銷燬一個Service
注意程序中的註釋:
//啓動SecondActivity
intent2=new Intent(context, SecondActivity.class);
//在廣播接收者中直接啓動activity即直接寫context.startActivity(intent2)會出異常,所以
//加下面一句,設置一個標誌——intent裏的FLAG_ACTIVITY_NEW_TASK,因爲涉及到Activity裏的
//棧,這句話會把activity啓動到一個新的任務棧裏面去,如果在activity裏面啓動另一個activity
//可以不寫這一句,因爲他們在同一個任務棧裏面,而廣播接收者沒有任務棧,如果沒有這句話,啓動
//會失敗
intent2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent2);
//爲什麼要開一個線程呢?
//因爲Service裏面的on開頭的方法比如onStartCommand都在
//主線程裏面運行的(activity的main、UI等在同一線程),所以循環操作不能寫在主線程裏面
//另外如果把Service關掉或者Activity關掉,裏面的線程還未執行完的話,依然還在運行,
//所以onDestroy()設置false
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity implements OnClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setListener();
}
private void setListener() {
findViewById(R.id.btnStartActivity).setOnClickListener(this);
findViewById(R.id.btnStartService).setOnClickListener(this);
findViewById(R.id.btnStopService).setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent intent=new Intent();
switch (v.getId()) {
case R.id.btnStartActivity:
intent.setAction("com.sxt.day07_05.start_activity");
break;
case R.id.btnStartService:
intent.setAction("com.sxt.day07_05.start_service");
break;
case R.id.btnStopService:
intent.setAction("com.sxt.day07_05.stop_service");
break;
}
sendBroadcast(intent);
}
}
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.SystemClock;
import android.util.Log;
public class MyService extends Service {
boolean mLooper=true;//true:循環繼續
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
//爲什麼要開一個線程呢?
//因爲Service裏面的on開頭的方法比如onStartCommand都在
//主線程裏面運行的(activity的main、UI等在同一線程),所以循環操作不能寫在主線程裏面
//另外如果把Service關掉或者Activity關掉,裏面的線程還未執行完的話,依然還在運行,
//所以onDestroy()設置false
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
new Thread(){
public void run() {
while(mLooper){
SystemClock.sleep(1000);
Log.i("main","service is loop...");
}
};
}.start();
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
super.onDestroy();
mLooper=false;
}
}
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action=intent.getAction();
Intent intent2=null;
if(action.equals("com.sxt.day07_05.start_activity")){
//啓動SecondActivity
intent2=new Intent(context, SecondActivity.class);
//在廣播接收者中直接啓動activity即直接寫context.startActivity(intent2)會出異常,所以
//加下面一句,設置一個標誌——intent裏的FLAG_ACTIVITY_NEW_TASK,因爲涉及到Activity裏的
//棧,這句話會把activity啓動到一個新的任務棧裏面去,如果在activity裏面啓動另一個activity
//可以不寫這一句,因爲他們在同一個任務棧裏面,而廣播接收者沒有任務棧,如果沒有這句話,啓動
//會失敗
intent2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent2);
}else if(action.equals("com.sxt.day07_05.start_service")){
intent2=new Intent(context, MyService.class);
context.startService(intent2);
}else if(action.equals("com.sxt.day07_05.stop_service")){
intent2=new Intent(context, MyService.class);
context.stopService(intent2);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sxt.day07_05"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.sxt.day07_05.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.sxt.day07_05.MyReceiver" >
<intent-filter>
<action android:name="com.sxt.day07_05.start_activity" />
<action android:name="com.sxt.day07_05.start_service" />
<action android:name="com.sxt.day07_05.stop_service" />
</intent-filter>
</receiver>
<service android:name="com.sxt.day07_05.MyService" />
<activity
android:name="com.sxt.day07_05.SecondActivity"
android:label="@string/title_activity_second" >
</activity>
</application>
</manifest>
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class SecondActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second, menu);
return true;
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btnStartActivity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="start activity" />
<Button
android:id="@+id/btnStartService"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="start service" />
<Button
android:id="@+id/btnStopService"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="stop service" />
</LinearLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".SecondActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="SecondActivity" />
</RelativeLayout>