我想在我的应用程序中实现屏幕锁定功能,但目前我无法让它工作.我有一个alertDialog,它将通过使用几个按钮请求用户输入.如果用户按“否”,我想锁定屏幕(无限期,不是一段时间).以编程方式锁定屏幕的最佳方法是什么？我尝试使用以下,但是,虽然我的对话框被解除,屏幕永远不会锁定.
KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
lock.reenableKeyguard();
mycode的
import android.app.Activity;
import android.app.AlertDialog;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Window;
public class MyApp extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
this.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
startDialog();
}
private void startDialog() {
AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this);
myAlertDialog.setMessage("Do you want to exit the application?");
myAlertDialog.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
// do something when the button is clicked
public void onClick(DialogInterface arg0,int arg1) {
System.out.println("...yes button is clicked..");
arg0.dismiss();
}
});
myAlertDialog.setNegativeButton("NO",int arg1) {
System.out.println("...clicked no...");
arg0.dismiss();
KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
lock.reenableKeyguard();
}
});
AlertDialog alert = myAlertDialog.create();
myAlertDialog.setCancelable(false);
alert.setCancelable(false);
alert.getWindow().setLayout(600,400);
myAlertDialog.show();
}
}
在Manifest中添加
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>
有谁知道我做错了什么？
解决方法
您可以通过两种方式锁定屏幕：
PowerManager manager = (PowerManager) getSystemService(Context.POWER_SERVICE); // Choice 1 manager.goToSleep(int amountOfTime); // Choice 2 PowerManager.WakeLock wl = manager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,"Your Tag"); wl.acquire(); wl.release();
需要此权限：
<uses-permission android:name="android.permission.WAKE_LOCK" />
更新：
screenbrightness的值介于0和1之间.如果该值设置为负数,则将其设置为默认屏幕亮度.通过将亮度更改为0,亮度将足够低,屏幕将自动关闭.
WindowManager.LayoutParams params = getWindow().getAttributes(); params.screenBrightness = 0; getWindow().setAttributes(params);
更新2：
http://rdcworld-android.blogspot.in/2012/03/lock-phone-screen-programmtically.html
http://developer.android.com/guide/topics/admin/device-admin.html#lock
