Android中常用的系统服务

偏执的太偏执、 2022-09-25 14:17 198阅读 0赞

package com.example.systemservicedemo;
    
    import android.app.Activity;
    import android.app.ActivityManager;
    import android.content.Context;
    import android.media.AudioManager;
    import android.net.ConnectivityManager;
    import android.net.NetworkInfo;
    import android.net.wifi.WifiManager;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.Toast;
    
    
    public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            LayoutInflater inflater =(LayoutInflater) MainActivity.this.getSystemService(LAYOUT_INFLATER_SERVICE);
            View view =inflater.inflate(R.layout.activity_main,null);
            setContentView(R.layout.activity_main);
        }
        public void doClick(View view){
        	switch (view.getId()) {
    		case R.id.network:
    			if(isNetWorkConnected(MainActivity.this)==true){
    				Toast.makeText(MainActivity.this,"网络已经打开",Toast.LENGTH_SHORT).show();
    			}
    			else{
    				Toast.makeText(MainActivity.this,"网络未连接",Toast.LENGTH_SHORT).show();
    			}
    			break;
    		case R.id.enableOrDisable:
    			WifiManager wifiManager=(WifiManager) MainActivity.this.getSystemService(WIFI_SERVICE);
    			if(wifiManager.isWifiEnabled()){
    				wifiManager.setWifiEnabled(false);
    				Toast.makeText(MainActivity.this,"WIFI已关闭",Toast.LENGTH_SHORT).show();
    			}else {
    				wifiManager.setWifiEnabled(true);
    				Toast.makeText(MainActivity.this,"WIFI已打开",Toast.LENGTH_SHORT).show();
    			}
    			break;
    			case R.id.getvoice:
    				AudioManager audioManager=(AudioManager) MainActivity.this.getSystemService(AUDIO_SERVICE);
    				int max=audioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM);
    				int current=audioManager.getStreamVolume(AudioManager.STREAM_RING);
    				Toast.makeText(MainActivity.this,"当前最大音量："+max+"当前音量："+current,Toast.LENGTH_SHORT).show();
    				break;
    			case R.id.getProcessPakage:
    				ActivityManager activityManager=(ActivityManager) MainActivity.this.getSystemService(ACTIVITY_SERVICE);
    				String pakageName=activityManager.getRunningTasks(1).get(0).topActivity.getPackageName();
    				Toast.makeText(MainActivity.this,"当前运行的包名："+pakageName,Toast.LENGTH_SHORT).show();
    				break;
    		default:
    			break;
    		}
        }
        public boolean isNetWorkConnected(Context context){
        	if(context!=null){
        		ConnectivityManager manager=(ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
        		NetworkInfo networkInfo=manager.getActiveNetworkInfo();
        		if(networkInfo!=null){
        			return networkInfo.isAvailable();
        		}
        	}
        	return false;
        }
    }

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.systemservicedemo"
        android:versionCode="1"
        android:versionName="1.0" >
    
        <uses-sdk
            android:minSdkVersion="15"
            android:targetSdkVersion="20" />
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
        <uses-permission android:name="android.permission.GET_TASKS" /><uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
        
    
        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name=".MainActivity"
                android:label="@string/app_name" >
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>