/**
 * Confirm and execute a reset of the device to a clean "just out of the box"
 * state.  Multiple confirmations are required: first, a general "are you sure
 * you want to do this?" prompt, followed by a keyguard pattern trace if the user
 * has defined one, followed by a final strongly-worded "THIS WILL ERASE EVERYTHING
 * ON THE PHONE" prompt.  If at any time the phone is allowed to go to sleep, is
 * locked, et cetera, then the confirmation sequence is abandoned.
 *
 * This is the confirmation screen.
 */
public class MasterClearConfirm extends OptionsMenuFragment {

 

private void doMasterClear() {

}

 

frameworks/base/core/res/AndroidManifest.xml:3371:                <action android:name="android.intent.action.MASTER_CLEAR" />

MasterClearReceiver.java

    public void onReceive(final Context context, final Intent intent) {

         RecoverySystem.rebootWipeUserData(context, shutdown, reason, forceWipe);//     * Reboots the device and wipes the user data and cache partitions. 

         if (wipeExternalStorage) {
            // thr will be started at the end of this task.
            new WipeAdoptableDisksTask(context, thr).execute();
        }

}

 

RecoverySystem.java

    /** Used to communicate with recovery.  See bootable/recovery/recovery.cpp. */
    private static final File RECOVERY_DIR = new File("/cache/recovery");
    private static final File LOG_FILE = new File(RECOVERY_DIR, "log");