Question

我正在做一个锁定屏幕的应用程序。现在它是锁定的，如果屏幕没有进入必须打开屏幕的服务，它就从那里进入广播接收器。

以下是广播接收器：

  public class ScreenReceiver extends BroadcastReceiver {   
    public static boolean wasScreenOn = true;
    @Override
    public void onReceive(Context context, Intent intent) {

        System.out.println("Entered Broadcaste Reciever");

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            // DO WHATEVER YOU NEED TO DO HERE
             System.out.println("SCREEN_OFF"+wasScreenOn);
            wasScreenOn = false;

            Intent i = new Intent(context, UpdateService.class);
            i.putExtra("screen_state", wasScreenOn);
            context.startService(i);

            System.out.println("jrkejhr keh");
        }
        else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            // AND DO WHATEVER YOU NEED TO DO HERE
            wasScreenOn = true;
            System.out.println("SCREEN_ON"+wasScreenOn);
        }
    }

它进入我写过回家意图行动的服务是......

  ShakeListener mShaker;
    int amountOfTime = 0;
    Context context1;   
    @Override   
         public void onCreate() {

            super.onCreate();

            // REGISTER RECEIVER THAT HANDLES SCREEN ON AND SCREEN OFF LOGIC
            System.out.println("Enterd Service");
            final Vibrator vibe = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);

            mShaker = new ShakeListener(this);
            mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
              public void onShake() {
                vibe.vibrate(100);
                Intent goHome = new Intent();
                goHome.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                goHome.setAction("android.intent.action.MAIN");
                goHome.addCategory("android.intent.category.HOME");
                startActivity(goHome);                      
               }
            });
         }
       @Override
        public IBinder onBind(Intent intent) {
            // TODO Auto-generated method stub
            return null;
     }

它正在进入该服务。但是主屏幕没有显示。调用服务时，屏幕被锁定。

Answer 1

修改

由于某些人在以编程方式锁定后需要帮助解锁设备，我是通过Android screen lock/ unlock programatically发来的，请看看，可以帮助你。

原始答案是：

您需要获得管理员权限才能锁定手机屏幕

请查看以下简单教程以获得此

Lock Phone Screen Programmtically

这里也是代码示例..

<强> LockScreenActivity.java

public class LockScreenActivity extends Activity implements OnClickListener { private Button lock; private Button disable; private Button enable; static final int RESULT_ENABLE = 1; DevicePolicyManager deviceManger; ActivityManager activityManager; ComponentName compName; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); deviceManger = (DevicePolicyManager)getSystemService( Context.DEVICE_POLICY_SERVICE); activityManager = (ActivityManager)getSystemService( Context.ACTIVITY_SERVICE); compName = new ComponentName(this, MyAdmin.class); setContentView(R.layout.main); lock =(Button)findViewById(R.id.lock); lock.setOnClickListener(this); disable = (Button)findViewById(R.id.btnDisable); enable =(Button)findViewById(R.id.btnEnable); disable.setOnClickListener(this); enable.setOnClickListener(this); } @Override public void onClick(View v) { if(v == lock){ boolean active = deviceManger.isAdminActive(compName); if (active) { deviceManger.lockNow(); } } if(v == enable){ Intent intent = new Intent(DevicePolicyManager .ACTION_ADD_DEVICE_ADMIN); intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, compName); intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "Additional text explaining why this needs to be added."); startActivityForResult(intent, RESULT_ENABLE); } if(v == disable){ deviceManger.removeActiveAdmin(compName); updateButtonStates(); } } private void updateButtonStates() { boolean active = deviceManger.isAdminActive(compName); if (active) { enable.setEnabled(false); disable.setEnabled(true); } else { enable.setEnabled(true); disable.setEnabled(false); } } protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case RESULT_ENABLE: if (resultCode == Activity.RESULT_OK) { Log.i("DeviceAdminSample", "Admin enabled!"); } else { Log.i("DeviceAdminSample", "Admin enable FAILED!"); } return; } super.onActivityResult(requestCode, resultCode, data); } }

MyAdmin.java

public class MyAdmin extends DeviceAdminReceiver{ static SharedPreferences getSamplePreferences(Context context) { return context.getSharedPreferences( DeviceAdminReceiver.class.getName(), 0); } static String PREF_PASSWORD_QUALITY = "password_quality"; static String PREF_PASSWORD_LENGTH = "password_length"; static String PREF_MAX_FAILED_PW = "max_failed_pw"; void showToast(Context context, CharSequence msg) { Toast.makeText(context, msg, Toast.LENGTH_SHORT).show(); } @Override public void onEnabled(Context context, Intent intent) { showToast(context, "Sample Device Admin: enabled"); } @Override public CharSequence onDisableRequested(Context context, Intent intent) { return "This is an optional message to warn the user about disabling."; } @Override public void onDisabled(Context context, Intent intent) { showToast(context, "Sample Device Admin: disabled"); } @Override public void onPasswordChanged(Context context, Intent intent) { showToast(context, "Sample Device Admin: pw changed"); } @Override public void onPasswordFailed(Context context, Intent intent) { showToast(context, "Sample Device Admin: pw failed"); } @Override public void onPasswordSucceeded(Context context, Intent intent) { showToast(context, "Sample Device Admin: pw succeeded"); } }

Answer 2

使用Activity.getWindow()获取活动窗口;使用Window.addFlags()添加您想要的WindowManager.LayoutParams中的以下标志中的任何一个：

Answer 3

示例页面上的androidmanifest.xml和policies.xml文件在我的浏览器中是不可见的，因为它尝试将XML文件格式化为HTML。我只是为了方便他人而发布这个以供参考，这来自示例页面。

感谢所有人提出这个有用的问题！

<强>的AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.kns"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".LockScreenActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name=".MyAdmin"
                android:permission="android.permission.BIND_DEVICE_ADMIN">
            <meta-data android:name="android.app.device_admin"
                       android:resource="@xml/policies" />
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>
        </receiver>

    </application>
</manifest>

<强> policies.xml

<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-policies>
        <limit-password />
        <watch-login />
        <reset-password />
        <force-lock />
        <wipe-data />
    </uses-policies>
</device-admin>

如何以编程方式锁定/解锁屏幕？

3 个答案: