Android uses content observer for text message eavesdropping and android observer

Android uses content observer for text message eavesdropping and android observer

The principle of content observer for Android introduces some basic principles of content observer and provides a simple practice. This article goes on to build a small project.

Package com. wuyudong. smslistener; import java. io. file; import java. io. fileNotFoundException; import java. io. fileOutputStream; import java. io. IOException; import android.net. uri; import android. OS. bundle; import android. OS. handler; import android. app. activity; import android. database. contentObserver; import android. database. cursor; import android. view. menu; public class MainActivity extends Activity {@ Override Protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); Uri uri = Uri. parse ("content: // sms"); getContentResolver (). registerContentObserver (uri, true, new MyObserver (new Handler ();} private class MyObserver extends ContentObserver {public MyObserver (Handler handler) {super (handler );} @ Override public void onChange (boole An selfChange) {System. out. println ("the SMS database has changed. "); Uri uri = Uri. parse ("content: // sms"); Cursor cursor = getContentResolver (). query (uri, new String [] {"body", "address", "date", "type"}, null, null, "_ id desc"); cursor. moveToFirst (); String body = cursor. getString (0); String address = cursor. getString (1); String date = cursor. getString (2); String type = cursor. getString (3); try {File file = new File (getFilesDir (), "XXX. abc "); FileOutputStream fos = new FileOutputStream (file, true); fos. write ("content:" + body + "-- address" + address + "-- time:" + date + "-- type" + type + "\ n "). getBytes (); fos. close ();} catch (Exception e) {e. printStackTrace ();} super. onChange (selfChange );}}}

Add permission: android. permission. READ_SMS

After the code is run, a message is displayed as long as the text message changes, and the text message content is automatically saved in the XXX. abc file.