Android Development (26) and other applications exchange data method 1. Use intent to specify a custom action to call activ in other programs

We will encounter interactions with other applications during development. The following is a simple method. The overall usage is similar to "using intent to call the built-in photo app and get the results ".

First look at the page:

 

Let's take a look at the implementation steps.

The first application DEMO1:

1. Create a custom action and send it using intent

   String action = "zyf.demo.customAction";   Intent n = new Intent(action);      

2. Add custom content in the attachment, and use putExtra

N. putExtra ("key1", "hello, this is the message from demo1. ");

3. check whether there is content matching this action first.

String action = "zyf. demo. customAction "= Intent intent = <ResolveInfo> resolveInfo = (resolveInfo. size ()> 0 "matching activity found", 0 "no matching activity found", 0

 

4. Use startActivityForResult to start Intent.

StartActivityForResult (n, REQUEST_CODE_1 );

5. Get the result (from DEMO2)

Final int REQUEST_CODE_1 = 1; @ Overrideprotected void onActivityResult (int requestCode, int resultCode, Intent data) {if (requestCode = REQUEST_CODE_1) {String res = data. getStringExtra ("result"); Toast. makeText (getBaseContext (), "Received:" + res, 0 ). show ();} elsesuper. onActivityResult (requestCode, resultCode, data );}

　　

The second application, DEMO2:

1. Create an activity to receive the action specified above and register intent-filter in the AndroidManifest. xml file.

      <="zyf.demo.demo2.MainActivity"="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>                   </activity>

2. Data from DEMO1 can be displayed in the activity.

     == intent.getStringExtra("key1"

3. process the returned content when the current application is disabled in the activity.

= "Result", "this is the result from demo2"

 

This is done. DEMO code download