android 监听USB连接状态
16lz
2021-12-04
android 4.4上发现采用原来的什么Intent.ACTION_UMS_CONNECTED完全不能够检测到USB让连接状态,
翻看了一下源码,找到一个方法:
private final static String ACTION = "android.hardware.usb.action.USB_STATE";
这个action可以在frameworks层的UsbManager.java文件中发现。
定义广播:
BroadcastReceiver usBroadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString action = intent.getAction();Toast.makeText(MainActivity.this, "aciton = " + action, Toast.LENGTH_SHORT).show();if (action.equals(ACTION)) {boolean connected = intent.getExtras().getBoolean("connected");Toast.makeText(MainActivity.this, "aciton = " + connected, Toast.LENGTH_SHORT).show();if (connected) {showUSBConntectStatus.setText("USB Connected!");} else {showUSBConntectStatus.setText("USB DisConnected!");}}}};
注册广播:
IntentFilter filter = new IntentFilter();filter.addAction(ACTION);registerReceiver(usBroadcastReceiver, filter);
注意的manifest中设置minSDK:
android:minSdkVersion="12"
在测试的过程中发现,将minSdkVersion设置为8,不能侦测到USB的状态
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