Android监听USB连接/断开，充电/未充电

﹏ヽ暗。殇╰゛Y 2023-11-16 06:12 159阅读 0赞

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <TextView
                android:id="@+id/text"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
    
        </ScrollView>
    </LinearLayout>

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;
                }
            }
        };
    }