分享方法：android 获得屏幕状态

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical" >
   <!-- 定义获得屏幕状态的按钮 -->
   <Button
       android:id="@+id/reenableKeyguard"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="屏幕的状态" />
 
 
</RelativeLayout>

package com.example.yanlei.yl;
 
import android.app.KeyguardManager;
import android.content.Context;
import android.os.Bundle;
importandroid.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
 
 
 
public class MainActivity extendsAppCompatActivity {
   // 定义锁屏的按钮
   private Button btnKeyguard;
   //声明KeyguardManager对象
   private KeyguardManager keyguardManager;
 
 
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       // 获得KeyguardManager服务
       keyguardManager=(KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
       //得到布局中的所有对象
       findView();
       //设置对象的监听器
       setListener();
    }
 
   private void findView() {
       // 得到布局中的所有对象
       btnKeyguard = (Button) findViewById(R.id.reenableKeyguard);
    }
 
   private void setListener() {
       // 设置对象的监听器
       btnKeyguard.setOnClickListener(new OnClickListener() {
 
           @Override
           public void onClick(View arg0) {
                // TODO Auto-generated methodstub
                //判断当前屏幕的状态
               if(keyguardManager.isKeyguardLocked())
                {
                   Toast.makeText(MainActivity.this, "锁屏",Toast.LENGTH_SHORT).show();
                }
                else
                {
                    Toast.makeText(MainActivity.this,"没有锁屏", Toast.LENGTH_SHORT).show();
                }
           }
       });
    }
}