切换蓝牙时的无限活动循环

Question

我创建了一个应用程序来检查NFC标签的有效负载,当它与应用程序匹配时切换蓝牙.

不幸的是,应用程序似乎进入了一个无限循环,它要求用户允许操作蓝牙,忽略选择并再次启动(再次询问相同的问题/活动). onActivityResult似乎没有被召唤.

我的控制台日志调用的输出是:

Payload: 'quicktags-togglebluetooth'
Bluetooth should now be on

如果我继续在权限活动上点击"是",那么蓝牙将无限制地切换,控制台日志(logcat)如下所示:

Payload: quicktags-togglebluetooth
Bluetooth should now be on
Bluetooth should now be off
Bluetooth should now be on
Bluetooth should now be off
Bluetooth should now be on
Bluetooth should now be off

等等.

AndroidManifest列出了正确的权限,请参阅以下内容:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.getquicktags.qt"
    android:versionCode="1"
    android:versionName="1.0" android:installLocation="auto">

    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="14" />

    <uses-permission android:name="android.permission.NFC" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-feature android:name="android.hardware.nfc" android:required="true" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

         <activity
            android:name=".CardActivity"
            android:label="@string/app_name" >

            <!-- Handle a collectable card NDEF record -->
            <intent-filter>
                <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
                <data android:mimeType="application/vnd.getquicktags.qt"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
         </activity>

    </application>

</manifest>

CardActivity.java文件是启动此蓝牙混乱的原因,如下所示:

package com.getquicktags.qt;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.Log;
import android.bluetooth.*;

public class CardActivity extends Activity implements OnClickListener {

    private static final String TAG = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.card_activity);

        // see if app was started from a tag and show game console
        Intent intent = getIntent();

        if(intent.getType() != null && intent.getType().equals(MimeType.NFC_DEMO)) {
            Parcelable[] rawMsgs = getIntent().getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
            NdefMessage msg = (NdefMessage) rawMsgs[0];
            NdefRecord cardRecord = msg.getRecords()[0];
            String payload = new String(cardRecord.getPayload());

            Log.d(TAG, "Payload: '"+ payload +"'");

            if(payload.equals("quicktags-togglebluetooth")) {
                toggleBluetooth();
            }
        }
    }

    private void toggleBluetooth() {

        BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mBluetoothAdapter == null) {
            // Device does not support Bluetooth
            Log.d(TAG, "No Bluetooth on device");
            closeApp();
        }
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, 1);
            Log.d(TAG, "Bluetooth should now be on");
        } else {
            // Turn it off
            mBluetoothAdapter.disable();
            Log.d(TAG, "Bluetooth should now be off");
            closeApp();
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // Close the app
        Log.d(TAG, "Close the app call");
        closeApp();
    }


    private void closeApp() {
        Log.d(TAG, "And... close it. This is inside closeApp()");
        android.os.Process.killProcess(android.os.Process.myPid());
    }

    public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub

    }
}

你可以看到,根据logcat,onActivityResults因此closeApp不会被调用.

我在Nexus 7上进行测试.标签很好,我已经使用各种NFC阅读器进行了测试.

扫描标签时,logcat会出现一些错误,但它们似乎对我没有多大意义.见下文:

01-07 00:18:41.595: E/bt-btif(5830): btif_enable_service: current services:0x100020
01-07 00:18:41.605: E/bt-btif(5830): btif_enable_service: current services:0x140020
01-07 00:18:41.605: E/bt-btif(5830): btif_enable_service: current services:0x140020
01-07 00:18:42.415: E/bt-btif(5830): Calling BTA_HhEnable
01-07 00:18:42.415: E/btif_config.c(5830): ## btif_config_get assert section && *section && key && *key && name && *name && bytes && type failed at line:186 ##
01-07 00:18:42.415: E/bt-btif(5830): btif_storage_get_adapter_property service_mask:0x140020
01-07 00:18:42.435: E/btif_config.c(5830): ## btif_config_get assert section && *section && key && *key && name && *name && bytes && type failed at line:186 ##
01-07 00:18:42.445: E/bt_h4(5830): vendor lib postload completed
01-07 00:18:42.545: E/BluetoothServiceJni(5830): SOCK FLAG = 1 ***********************
01-07 00:18:42.605: E/BluetoothServiceJni(5830): SOCK FLAG = 0 ***********************
01-07 00:18:42.715: E/BtOppRfcommListener(5830): Error accept connection java.io.IOException: read failed, socket might closed, read ret: -1
01-07 00:18:42.915: E/bt-btif(5830): BTA AG is already disabled, ignoring ...
01-07 00:18:42.935: E/bt-btif(5830): btif_disable_service: Current Services:0x140020
01-07 00:18:42.945: E/bt-btif(5830): btif_disable_service: Current Services:0x100020
01-07 00:18:42.945: E/bt-btif(5830): btif_disable_service: Current Services:0x100020

非常感谢您提供的任何帮助.你可以想象,这让我很生气:)

Answer 1

你为什么要杀死进程closeApp()？我想这是你问题的一部分。只需调用finish()该 Activity，然后让 Android 在需要时清理您的进程即可。

当你杀死你的进程时，Android 会认为发生了一些不好的事情并尝试恢复。作为此恢复的一部分，它可能会重新传递意图，这可能不是您想要的