package heath.locknow;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Intent;
import android.content.Context;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lockScreen();
    }

    private void lockScreen()
    {
        DevicePolicyManager dpm = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
        ComponentName componentName = new ComponentName(this, MyDeviceAdminReceiver.class);

        boolean active = dpm.isAdminActive(componentName);
        if (!active) {
            // http://developer.android.com/reference/android/app/admin/DeviceAdminReceiver.html
            Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "我自己的LockNow");
            startActivityForResult(intent, 0);
        }

        try {
             dpm.lockNow();
        }
        catch (final Exception ex)
        {

        }

        android.os.Process.killProcess(android.os.Process.myPid());
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (0 == requestCode) {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

/**
 * Created by bright on 2015/10/29.
 */

package heath.locknow;

import android.app.admin.DeviceAdminReceiver;

public class MyDeviceAdminReceiver extends DeviceAdminReceiver {
}