android 屏幕变黑

Question

同志们，问大家一个问题：在应用中，如何通过代码把屏幕变黑，就是那种短按关机键的效果。散尽分求答案。

Answer 1

楼主要的是锁屏吗？package com.microdu.lockscreen;import android.app.Activity;
import android.app.admin.DeviceAdminReceiver;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;public class LockScreen extends DeviceAdminReceiver {
        static final int RESULT_ENABLE = 1;        public static class Controller extends Activity {                DevicePolicyManager mDPM;
                ComponentName mDeviceAdminSample;                @Override
                protected void onCreate(Bundle savedInstanceState) {
                        super.onCreate(savedInstanceState);
                        
                        //首先我们要获得android设备管理代理
                        mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
                        
                        //LockScreen 继承自 DeviceAdminReceiver
                        mDeviceAdminSample = new ComponentName(Controller.this,
                                        LockScreen.class);
                        //得到当前设备管理器有没有激活
                        boolean active = mDPM.isAdminActive(mDeviceAdminSample);
                        if (!active) { 
                                //如果没有激活的话，就去提示用户激活（第一次运行程序时）
                                getAdmin();
                        }else{
                                //如果已经激活的话，就执行立即锁屏
                                mDPM.lockNow();
                        }
                        
                //        killMyself ，锁屏之后就立即kill掉我们的Activity，避免资源的浪费;
                        android.os.Process.killProcess(android.os.Process.myPid()); 
                }        public void getAdmin() {
            // Launch the activity to have the user enable our admin.
            Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                    mDeviceAdminSample);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                    "欢迎您的使用！");
            startActivityForResult(intent, RESULT_ENABLE);
        }
                
        }
}manifest<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    android:versionCode="1"
    android:versionName="1.0" package="com.microdu.lockscreen">
    <uses-sdk android:minSdkVersion="8" />    <application android:label="@string/app_name"
            android:icon="@drawable/icon" >        <activity android:name="com.microdu.lockscreen.LockScreen$Controller" android:theme="@android:style/Theme.Translucent">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name="com.microdu.lockscreen.LockScreen"
                android:permission="android.permission.BIND_DEVICE_ADMIN">
            <meta-data android:name="android.app.device_admin"
                       android:resource="@xml/device_admin_sample" />
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>
        </receiver>
        
    </application>
</manifest>

Answer 2

楼上的哥们，我想要的结果是：
比如我又一个button，我点一下，然后就黑屏，就跟那个一键黑屏一样，
在按开机键（或者其他）就能点亮屏幕，默认进到锁屏，之后都是默认行为了

Answer 3

http://blog.csdn.net/etzmico/article/details/6848061
这就是你要的