android关闭屏幕时不锁屏实现

所需权限：

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

关闭系统锁屏服务：

KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
KeyguardManager.KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
lock.disableKeyguard();//关闭系统锁屏

这样在屏幕关闭重新打开时就看不到锁屏界面了

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如果要防止系统休眠：

所需权限：

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

代码实现：

PowerManager pm = (PowerManager) this
    .getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK
    | PowerManager.ON_AFTER_RELEASE, "ZAK");
if (null != wakeLock) {
  wakeLock.acquire();
}

或者禁止系统自动关屏:

所需权限：

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

代码实现：

setLockPatternEnabled(false);

public void setLockPatternEnabled(boolean enabled) {
  setBoolean(android.provider.Settings.System.LOCK_PATTERN_ENABLED,
      enabled);
}

private void setBoolean(String systemSettingKey, boolean enabled) {
  android.provider.Settings.System.putInt(getContentResolver(),
      systemSettingKey, enabled ? 1 : 0);
}