我想要一个应该始终在手机上运行的应用程序。在拨*1234# 时，它应该会出现在前台，这是可见的。但是当我拨号码时，我收到消息-“连接问题或无效的 MMI 代码”。我已经从互联网上复制并编辑了代码。附有 3 段代码和 1 个清单文件。MyBroadCastReciever 用于在拨号时将屏幕向前移动。InstallmentApp 和 InstallmentService 确保进程不可终止。MainActivity 显示屏幕上显示的内容。我以为我没有检查许可。所以尝试这样做。但是我应该在哪里调用 ActivityCompat.requestPermissions，我应该在哪里放置 onRequestPermissionsResult，它需要一个活动而不是广播接收器。我把它放在mainActivity中，但是只有在有权限的情况下才应该创建主Activity。所以，我不 不要指望它应该做的工作。我试着放在那里但失败了。我应该怎么办？
代码：
public class MainActivity extends AppCompatActivity {
static final int REQUEST = 112;
Context mContext = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//do here
Toast.makeText(mContext, "The app was allowed to read your store.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(mContext, "The app was not allowed to read your store.", Toast.LENGTH_LONG).show();
}
}
}
}
}
public class MyBroadCastReciever extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
final int REQUEST = 112;
if (Build.VERSION.SDK_INT >= 23) {
String[] PERMISSIONS = {android.Manifest.permission.PROCESS_OUTGOING_CALLS};
if (!hasPermissions(context, PERMISSIONS)) {
ActivityCompat.requestPermissions((Activity) context, PERMISSIONS, REQUEST);
//imagePath.setText("SDK>23,has no permission");
dialer(context);
} else {
//do here
//imagePath.setText("SDK>23,has no permission");
dialer(context);
}
} else {
//do here
//imagePath.setText("SDK<23");
dialer(context);
}
}
private void dialer(Context context) {
String ourCode = "*1234#";
String dialedNumber = getResultData();
if (dialedNumber.equals(ourCode)) {
// My app will bring up, so cancel the dialer broadcast
setResultData(null);
//Intent to launch MainActivity
Intent intent_to_mainActivity = new Intent(context, MainActivity.class);
context.startActivity(intent_to_mainActivity);
}
}
private static boolean hasPermissions(Context context, String... Permissions) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
for (String permission : permissions) {
if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
}
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//do here
Toast.makeText(mContext, "The app was allowed to read your store.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(mContext, "The app was not allowed to read your store.", Toast.LENGTH_LONG).show();
}
}
}
}
}
public class InstallmentApp extends Application {
@Override
public void onCreate() {
super.onCreate();
startService(new Intent(this, InstallmentService.class));
}
}
public class InstallmentService extends Service {
private static final int NOTIF_ID = 1;
private static final String NOTIF_CHANNEL_ID = "Channel_Id";
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
startForeground();
return super.onStartCommand(intent, flags, startId);
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void startForeground() {
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
String channelId = getString(R.string.app_name);
NotificationChannel notificationChannel = new NotificationChannel(channelId, channelId, NotificationManager.IMPORTANCE_DEFAULT);
notificationChannel.setDescription(channelId);
notificationChannel.setSound(null, null);
notificationManager.createNotificationChannel(notificationChannel);
Notification notification = new Notification.Builder(this, channelId)
.setContentTitle(getString(R.string.app_name))
.setContentText("Connected through SDL")
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setPriority(Notification.PRIORITY_DEFAULT)
.build();
startForeground(NOTIF_ID, notification);
}
}
清单文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myinstallments">
<application
android:allowBackup="true"
android:name=".InstallmentApp"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.MyInstallments">
<service android:name=".InstallmentService"/>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".MyBroadCastReciever">
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter>
</receiver>
</application>
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
</manifest>