android - 如何锁定安卓设备的屏幕

Question

我想在我的应用程序中实现屏幕锁定功能，但目前无法实现。我有一个 alertDialog，它将通过使用几个按钮请求用户输入。如果用户按下“否​​”，我想锁定屏幕(无限期地，而不是固定的时间)。以编程方式锁定屏幕的最佳方法是什么？我尝试使用以下方法，但尽管我的对话框被关闭，但屏幕永远不会锁定。

KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE); 
                        KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
                        lock.reenableKeyguard();

MyCode

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",
                new DialogInterface.OnClickListener() {

                    // do something when the button is clicked
                    public void onClick(DialogInterface arg0, 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 list 中添加

<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>

有人知道我做错了什么吗？

Answer 1

有两种方法可以锁定屏幕:

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:

屏幕亮度的值介于 0 和 1 之间。如果该值设置为负数，则会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);

This和 this可能会进一步帮助您。

更新 2:

以下是一些用于锁定屏幕的方法的链接:

http://rdcworld-android.blogspot.in/2012/03/lock-phone-screen-programmtically.html

http://developer.android.com/guide/topics/admin/device-admin.html#lock