Android 11.0 USB插入时自动进入文件传输界面

frameworks/base/services/core/java/com/android/server/policy

import android.content.ComponentName;

在init()方法里，注册监听USB插拔的系统广播android.hardware.usb.action.USB_STATE

        // wangrui Monitor USB data cable plugging and unplugging broadcasts
        context.registerReceiver(mUSBReceiver, new IntentFilter("android.hardware.usb.action.USB_STATE"));

收到广播后，利用隐式Intent 启动Settings界面。

    // wangrui When the USB data cable is inserted, a file transfer dialog box pops up
    BroadcastReceiver mUSBReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            boolean connected = intent.getExtras().getBoolean("connected");
            if (connected) {
                Intent intent1 = Intent.makeRestartActivityTask(
                        new ComponentName("com.android.settings",
                                "com.android.settings.Settings$UsbDetailsActivity"));
                mContext.startActivity(intent1);
            }
        }
    };

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