Android监听USB连接/断开，充电/未充电

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package zhangphil.adb;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.BatteryManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.TextView;import java.text.SimpleDateFormat;import java.util.Date;public class MainActivity extends AppCompatActivity {    private String TAG = "USB连接状态";    private final static String USB_ACTION = "android.hardware.usb.action.USB_STATE";    private TextView text;    private String string = "";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        text = findViewById(R.id.text);        IntentFilter filter = new IntentFilter();        filter.addAction(Intent.ACTION_BATTERY_CHANGED);        filter.addAction(Intent.ACTION_BATTERY_LOW);        filter.addAction(Intent.ACTION_BATTERY_OKAY);        filter.addAction(Intent.ACTION_POWER_CONNECTED);        filter.addAction(Intent.ACTION_POWER_DISCONNECTED);        filter.addAction(USB_ACTION);        registerReceiver(mBroadcastReceiver, filter);        registerReceiver(mBroadcastReceiver, new IntentFilter(USB_ACTION));    }    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(mBroadcastReceiver);    }    private void displayMsg(String s) {        SimpleDateFormat sdf = new SimpleDateFormat("MM-dd HH:mm:ss:SSS");        string = string + sdf.format(new Date()) + "\t\t" + s + "\n";        text.setText(string);    }    private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            switch (action) {                case USB_ACTION:                    boolean connected = intent.getExtras().getBoolean("connected");                    if (connected) {                        displayMsg("USB已连接");                    } else {                        displayMsg("USB未连接");                    }                    break;                case Intent.ACTION_BATTERY_CHANGED:                    //电量发生改变。                    displayMsg("电量发生改变");                    boolean isCharging = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) != 0;                    if (isCharging) {                        //剩余电量。                        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);                        //电量最大值。                        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);                        //电量百分比。                        float batteryPct = level / (float) scale;                        displayMsg("充电," + level + "-" + batteryPct + "-" + scale);                    }                    break;                case Intent.ACTION_BATTERY_LOW:                    displayMsg("电量过低");                    break;                case Intent.ACTION_BATTERY_OKAY:                    displayMsg("电量满");                    break;                case Intent.ACTION_POWER_CONNECTED:                    displayMsg("电源接通");                    break;                case Intent.ACTION_POWER_DISCONNECTED:                    displayMsg("电源断开");                    break;            }        }    };}

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