Android简单的来电讲话者例子

Android通过android speech api 和 telephony manager 提供了知道来电号码并用语音讲出的功能。

在这里，我们将开发一个基本的Android应用，当手机处于响铃模式时，它会说出来电号码。

在下一页中，我们将看到这个应用的完整版本，它讲述来电者的姓名，并提供更改速度和音调的设置选项。此外，它还提供在来电号码或来电者姓名之前和之后添加文本的选项。

activity_main.xml

这里我们没有做任何特殊的事情。它只有一个简单的文本视图。

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

Activity类

在这个活动中，我们已经编写了代码来了解电话状态，并通过TextToSpeech类来讲述来电号码。

package com.example.callertalker;
import java.util.Locale;
import android.media.AudioManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;
import android.speech.tts.TextToSpeech;

public class MainActivity extends Activity implements TextToSpeech.OnInitListener {
    private TextToSpeech tts;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tts = new TextToSpeech(this, this);

        TelephonyManager telephonyManager = (TelephonyManager)getSystemService(
                                                                         Context.TELEPHONY_SERVICE);

        PhoneStateListener callStateListener = new PhoneStateListener() {
        public void onCallStateChanged(int state, String incomingNumber){
              if(state==TelephonyManager.CALL_STATE_RINGING){
                  tts.speak(incomingNumber+" calling", TextToSpeech.QUEUE_FLUSH, null);
                  Toast.makeText(getApplicationContext(),"Phone is Ringing : "+incomingNumber, 
                                                                               Toast.LENGTH_LONG).show();
                 }
              if(state==TelephonyManager.CALL_STATE_OFFHOOK){
                    Toast.makeText(getApplicationContext(),"Phone in a call or call picked", 
                                                                                  Toast.LENGTH_LONG).show();
              }
              if(state==TelephonyManager.CALL_STATE_IDLE){
                    //phone is neither ringing nor in a call
              }
        }
        };
        telephonyManager.listen(callStateListener,PhoneStateListener.LISTEN_CALL_STATE);
    }

    @Override
    public void onInit(int status) {
        if (status == TextToSpeech.SUCCESS) {
            int result = tts.setLanguage(Locale.US);
            if (result == TextToSpeech.LANG_MISSING_DATA
                    || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                Log.e("TTS", "This Language is not supported");
            } else {        
            }

        } else {
            Log.e("TTS", "Initilization Failed!");
        }
    }

    @Override
    public void onDestroy() {
    // Don't forget to shutdown tts!
    if (tts != null) {
        tts.stop();
        tts.shutdown();
    }
    super.onDestroy();
    }
}

AndroidManifest.xml

你需要在这个 XML 文件中添加 READ_PHONE_STATE 得使用权限。让我们看看完整的代码。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:androclass="http://schemas.android.com/apk/res/android"
    package="com.example.callertalker"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.callertalker.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>
    </application>

</manifest>