檢查耳機是否在Android手機

Question

我只是想檢查，如果耳機在Android設備插入插入。

然後當我按下按鈕時，它應該檢查耳機是否插入。如果插入了耳機，那麼我會播放音頻，否則我會顯示一個吐司插入耳機，即我不會直到headhones在插入做任何事情

Answer 1

您可以使用BroadcastReceiver

public class MainActivity extends AppCompatActivity { 
    private MusicIntentReceiver myReceiver; 
    boolean isHeadphoneConnected; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     MusicIntentReceiver myReceiver = new MusicIntentReceiver(); 
     IntentFilter filter = new IntentFilter(Intent.ACTION_HEADSET_PLUG); 
     registerReceiver(myReceiver, filter); 
     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
      if(isHeadphoneConnected) 
       Toast.makeText(MainActivity.this,"Headset is plug in",Toast.LENGTH_LONG).show(); 
       else 
       Toast.makeText(MainActivity.this,"Headset is not plug in",Toast.LENGTH_LONG).show(); 
      } 
     }); 
    } 
    private class MusicIntentReceiver extends BroadcastReceiver { 
     @Override public void onReceive(Context context, Intent intent) { 
      if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) { 
       int state = intent.getIntExtra("state", -1); 
       switch (state) { 
        case 0: 
         isHeadphoneConnected = false; 

        break; 
        case 1: 
         isHeadphoneConnected = true; 
         break; 
       } 
      } 
     } 
    } 
}