onNewIntent调用时机

protected void onNewIntent (Intent intent)

Since: API Level 1

This is called for activities that set launchMode to "singleTop" in their package, or if a client used the FLAG_ACTIVITY_SINGLE_TOP flag when calling startActivity(Intent). In either case, when the activity is re-launched while at the top of the activity stack instead of a new instance of the activity being started, onNewIntent() will be called on the existing instance with the Intent that was used to re-launch it.

An activity will always be paused before receiving a new intent, so you can count on onResume() being called after this method.

Note that getIntent() still returns the original Intent. You can use setIntent(Intent) to update it to this new Intent.

Parameters
intent The new intent that was started for the activity.
-----------------------------------------------------------------------------------------------

在IntentActivity中重写下列方法:onCreate onStart onRestart  onResume  onPause onStop onDestroy  onNewIntent

一、其他应用发Intent,执行下列方法:
I/@@@philn(12410 ): onCreate
I/@@@philn(12410 ): onStart
I/@@@philn(12410 ): onResume

发Intent的方法:
Uri uri = Uri.parse("philn://blog.163.com");
Intent it = new Intent(Intent.ACTION_VIEW, uri);   
startActivity(it);

二、接收Intent声明:
 <activity android:name=".IntentActivity" android:launchMode="singleTask"
                  android:label="@string/testname">
             <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="philn"/>
            </intent-filter>
  </activity>

三、如果IntentActivity处于任务栈的顶端,也就是说之前打开过的Activity,现在处于
I/@@@philn(12410): onPause
I/@@@philn(12410): onStop 状态的话
其他应用再发送Intent的话,执行顺序为:
I/@@@philn(12410): onNewIntent
I/@@@philn(12410): onRestart
I/@@@philn(12410): onStart
I/@@@philn(12410): onResume

 

在Android应用程序开发的时候,从一个Activity启动另一个Activity并传递一些数据到新的Activity上非常简单,但是当您需要让后台运行的Activity回到前台并传递一些数据可能就会存在一点点小问题。

首先,在默认情况下,当您通过Intent启到一个Activity的时候,就算已经存在一个相同的正在运行的Activity,系统都会创建一个新的Activity实例并显示出来。为了不让Activity实例化多次,我们需要通过在AndroidManifest.xml配置activity的加载方式(launchMode)以实现单任务模式,如下所示:



1 <activity android:label="@string/app_name" android:launchmode="singleTask"android:name="Activity1">

2 </activity>


launchMode为singleTask的时候,通过Intent启到一个Activity,如果系统已经存在一个实例,系统就会将请求发送到这个实例上,但这个时候,系统就不会再调用通常情况下我们处理请求数据的onCreate方法,而是调用onNewIntent方法,如下所示:


1 protected void onNewIntent(Intent intent) {

2   super.onNewIntent(intent);

3   setIntent(intent);//must store the new intent unless getIntent() will return the old one

4   processExtraData();

5 }


不要忘记,系统可能会随时杀掉后台运行的Activity,如果这一切发生,那么系统就会调用onCreate方法,而不调用onNewIntent方法,一个好的解决方法就是在onCreate和onNewIntent方法中调用同一个处理数据的方法,如下所示:


01 public void onCreate(Bundle savedInstanceState) {

02   super.onCreate(savedInstanceState);

03   setContentView(R.layout.main);

04   processExtraData();

05 }

06  

07 protected void onNewIntent(Intent intent) {

08   super.onNewIntent(intent);

09   setIntent(intent);//must store the new intent unless getIntent() will return the old one

10   processExtraData()

11 }

12  

13 private void processExtraData(){

14   Intent intent = getIntent();

15   //use the data received here

16 }


from:http://blog.163.com/whatwhyhow@126/blog/static/133422389201131811752268/

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