Android四大组件——Service后台服务、前台服务、IntentService、跨进程服务、无障碍服务、系统服务

package com.handsome.boke2.Service; import android.annotation.TargetApi; import android.content.ComponentName; import android.content.Intent; import android.content.ServiceConnection; import android.media.AudioManager; import android.net.ConnectivityManager; import android.net.Network; import android.net.NetworkInfo; import android.net.wifi.WifiManager; import android.os.Binder; import android.os.Build; import android.os.IBinder; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import com.handsome.boke2.R; public class MainActivity extends AppCompatActivity { Button bt_open, bt_close; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); bt_open = (Button) findViewById(R.id.open); bt_close = (Button) findViewById(R.id.close); final Intent intent = new Intent(this, BackGroupService.class); //启动后台服务 bt_open.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { bindService(intent, conn, BIND_AUTO_CREATE); } }); //启动后台服务 bt_close.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { unbindService(conn); } }); //启动前台服务 startService(new Intent(this, ForegroundService.class)); } ServiceConnection conn = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { //拿到后台服务代理对象 BackGroupService.MyBinder myBinder = (BackGroupService.MyBinder) service; //调用后台服务的方法 myBinder.showToast(); myBinder.showList(); } @Override public void onServiceDisconnected(ComponentName name) { } }; public void isWifi() { WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE); boolean enabled = wm.isWifiEnabled(); } public void getMaxAudio() { AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE); int max = am.getStreamMaxVolume(AudioManager.STREAM_SYSTEM); int current = am.getStreamMaxVolume(AudioManager.STREAM_RING); } @TargetApi(Build.VERSION_CODES.M) public void isConnect() { ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); NetworkInfo info = cm.getActiveNetworkInfo(); boolean isAvailable = info.isAvailable(); } }