Android 从Activity中返回

Andriod中一个activity可以启动servce，broadcast，

activity 发送 broadcastreceiverIntent intent = new Intent("com.broncho.TEST_SERVICE");intent.putExtras(bundle);sendBroadcast(intent1);activity 启动 serviceIntent intent = new Intent("com.broncho.TEST_SERVICE");intent.putExtras(bundle);mContext.startService(intent);activity 停止 serviceIntent intent = new Intent("com.broncho.TEST_SERVICE");intent.putExtras(bundle);mContext.stopService(intent);

 

另外，也可以启动一个activity，当被启动的Activity执行完毕后返回调用的Activity中，方法如下

 

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/start_go" android:text="@string/startgo" /></LinearLayout>

 

second.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/text_view" android:text="@string/second_activity_text" /></LinearLayout>

 

ReturnFromActivity.java

 

package com.broncho.returnfromactivity;import android.app.Activity;import android.os.Bundle;import android.content.Intent;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class ReturnFromActivity extends Activity { /** Called when the activity is first created. */private final static int RESULT_FROM_SECONDACTIVITY = 1;private final String TAG = "ReturnFromActivity";private Button startBtn; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); startBtn = (Button)findViewById(R.id.start_go); startBtn.setOnClickListener(mOnClickListener); } @Override public void onStart(){ super.onStart(); } //@Override public void onActivityResult(int requestCode, int resultCode, Intent data){ switch(requestCode){ case RESULT_FROM_SECONDACTIVITY: Log.w(TAG, "------------------requestCode is: " + requestCode); Log.w(TAG, "---------------data.getStringExtra = " + data.getStringExtra("Hello")); break; } super.onActivityResult(requestCode, resultCode, data); } private OnClickListener mOnClickListener = new OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent("com.broncho.SecondActivity"); startActivityForResult(intent, RESULT_FROM_SECONDACTIVITY); } }; }

 

SecondActivity.java

 

package com.broncho.returnfromactivity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import java.util.Timer;import java.util.TimerTask;public class SecondActivity extends Activity {private String TAG = "SecondActivity";private Timer timer = new Timer();@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.second);Log.w(TAG, "---------------in second activity");}@Overridepublic void onStart(){super.onStart();timer.schedule(mTimerTask, 1000 * 3);}private TimerTask mTimerTask = new TimerTask(){@Overridepublic void run() {// TODO Auto-generated method stubIntent intent = new Intent("android.intent.action.MAIN");intent.putExtra("Hello", "hello_content");setResult(Activity.RESULT_OK, intent);finish();}};@Overridepublic void onResume(){super.onResume();}@Overridepublic void onDestroy(){super.onDestroy();}}