java - android - 返回类实例中更改的数据

Question

目标是拥有一个名为 CallReceiver 的类，它实现 BroadcastReceiver该类正在监听调用，当有调用时，它会将调用者号码返回到创建实例的 Activity 。

示例:

主要 Activity :

CallReciver callreciver = new CallReciver(getApplicationContext());

CallReciver.java

public class CallReceiver extends BroadcastReceiver {

private Context mContext;

CallReceiver(Context context) {
    this.mContext = context;
}

@Override
public void onReceive(Context context, Intent intent) {
    String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

    if (TelephonyManager.EXTRA_STATE_RINGING.equals(state)) {
        String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);

        Intent i = new Intent(mContext, MainActivity.class);
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        i.putExtra("callMsg", incomingNumber);

        mContext.startActivity(i);
    }
}

我尝试在检测到调用时发送带有号码的 Intent ，但问题是该 Intent 启动 Activity 并初始化变量，我只需要获取号码。

要求的结果:CallReceiver 将号码发送到 MainActivity

Answer 1

编辑答案，因为您的要求一开始并不明确。如果您只想要此接收器中的调用者号码，您可能想尝试此 fragment 。从这个答案得到这个想法 How to get phone number from an incoming call?

在您的 list 中:

<receiver android:name=".ServiceReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>

在您的接收器中:

public class ServiceReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, Intent intent) {
        TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
        telephony.listen(new PhoneStateListener(){
            @Override
            public void onCallStateChanged(int state, String incomingNumber) {
                super.onCallStateChanged(state, incomingNumber);
                Intent i = new Intent(mContext, MainActivity.class);
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                i.putExtra("callMsg", incomingNumber);
                mContext.startActivity(i);
            }
        },PhoneStateListener.LISTEN_CALL_STATE);
    }