为什么我的广播接收器不响应任何 phone 状态？

Question

实际上，我想要一个可以读取 phone 状态的广播接收器，例如 calling、OFFHOOK、idle。这是我的代码。

我在清单文件中添加了 <uses-permission> 用于读取 Phone 状态

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

这是我静态注册的接收器

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

这是MainActivity.Java

package com.example.callstateapp;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
    CallStateBroadcast myReceiver = new CallStateBroadcast();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(TelephonyManager.EXTRA_STATE);
        registerReceiver(myReceiver,intentFilter);
    }
}

这是CallStateBroadcast.Class

package com.example.callstateapp;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.widget.Toast;

public class CallStateBroadcast extends BroadcastReceiver {
    Context mContext;
    @Override
    public void onReceive(final Context context, Intent intent)
    {
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

        if (state.equals(TelephonyManager.EXTRA_STATE_RINGING))
            Toast.makeText(context, "Ringing...", Toast.LENGTH_SHORT).show();
        if (state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK))
            Toast.makeText(context, "Busy...", Toast.LENGTH_SHORT).show();
        if (state.equals(TelephonyManager.EXTRA_STATE_IDLE))
            Toast.makeText(context, "Free...", Toast.LENGTH_SHORT).show();
    }
}

Answer 1

要使用 READ_PHONE_STATE，您需要：

Note: If both your minSdkVersion and targetSdkVersion values are set to 3 or lower, the system implicitly grants your app this permission. If you don't need this permission, be sure your targetSdkVersion is 4 or higher.

那么，您需要指定：

<uses-sdk
 android:minSdkVersion="20"
 android:targetSdkVersion="whatyouwant" />

Answer 2

您需要在应用程序启动时至少注册一次接收器 class。您可以将它添加到您的 MainActivity.java 文件中，它将起作用。

MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    CallStateBroadcast myReceiver = new CallStateBroadcast();
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(TelephonyManager.EXTRA_STATE);
    registerReceiver(myReceiver,intentFilter);
}

CallStateBroadcast.java

public class CallStateBroadcast extends BroadcastReceiver {
    Context mContext;
    @Override
    public void onReceive(final Context context, Intent intent)
    {
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

        if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
            Log.e("Zed", "ringing");
            Toast.makeText(context, "Ringing...", Toast.LENGTH_SHORT).show();
        }
        if (state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)) {
            Log.e("Zed", "offhook");
            Toast.makeText(context, "Busy...", Toast.LENGTH_SHORT).show();
        }
        if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)) {
            Log.e("Zed", "idle");
            Toast.makeText(context, "Free...", Toast.LENGTH_SHORT).show();
        }
    }
}

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <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=".CallStateBroadcast">
        <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE"/>
        </intent-filter>
    </receiver>
</application>

编辑

我上传了我的示例项目代码供您检查。 MinSdk 版本 21，TargetSdk 30.

这是工作的记录。 https://i.stack.imgur.com/wqqqO.gif

为什么我的广播接收器不响应任何 phone 状态？

Why My broadcast receiver is not responding to any of the phone state?

java

android

broadcastreceiver