Android应用开发：电话监听和录音代码示例

在oncreate 中执行：

public void oncreate() {
  super.oncreate();
  log.i("tag", "服务启动了");

  // 对电话的来电状态进行监听
  telephonymanager telmanager = (telephonymanager) this
    .getsystemservice(context.telephony_service);
  // 注册一个监听器对电话状态进行监听
  telmanager.listen(new myphonestatelistener(),
    phonestatelistener.listen_call_state);
}

实现myphonestatelistener：

private class myphonestatelistener extends phonestatelistener {
  mediarecorder recorder;
  file audiofile;
  string phonenumber;

  public void oncallstatechanged(int state, string incomingnumber) {
   switch (state) {
   case telephonymanager.call_state_idle: /* 无任何状态时 */
    if (recorder != null) {
     recorder.stop(); //停止刻录
     recorder.reset(); //重设
     recorder.release(); //刻录完成一定要释放资源
    }
    break;
   case telephonymanager.call_state_offhook: /* 接起电话时 */

    try {
     recorder = new mediarecorder();
     recorder.setaudiosource(mediarecorder.audiosource.mic); // 设置音频采集原
     recorder.setoutputformat(mediarecorder.outputformat.three_gpp); //内容输出格式
     recorder.setaudioencoder(mediarecorder.audioencoder.amr_nb); //音频编码方式

     // recorder.setoutputfile("/sdcard/myvoice.amr");
     audiofile = new file(
       environment.getexternalstoragedirectory(),
       phonenumber + "_" + system.currenttimemillis()
         + ".3gp");
     recorder.setoutputfile(audiofile.getabsolutepath());
     log.i("tag", audiofile.getabsolutepath());

     recorder.prepare(); //预期准备
     recorder.start();

    } catch (illegalstateexception e) {
     e.printstacktrace();
    } catch (ioexception e) {
     e.printstacktrace();
    }

    break;
   case telephonymanager.call_state_ringing: /* 电话进来时 */
    phonenumber = incomingnumber;
    break;
   default:
    break;
   }
   super.oncallstatechanged(state, incomingnumber);
  }
 }

通过上续两个对应的步骤即可以实现通过server对电话的监听工作，在call_state_idle无状态（即空闲状态）、call_state_offhook 接通电话（即挂起）、call_state_ringing 电话进来（即来电时）这几个状态中执行。

附：android拍照、录像、录音代码范例

package com.cons.dcg.collect;

import java.io.file;
import java.text.simpledateformat;
import java.util.*;
import android.app.*;
import android.content.intent;
import android.database.cursor;
import android.net.uri;
import android.os.asynctask;
import android.os.bundle;
import android.os.environment;
import android.provider.mediastore;
import android.view.*;
import android.widget.*;

public class recordactivity extends activity implements onclicklistener {

        private static final int result_capture_image = 1;// 照相的requestcode
        private static final int request_code_take_video = 2;// 摄像的照相的requestcode
        private static final int result_capture_recorder_sound = 3;// 录音的requestcode

        private string strimgpath = "";// 照片文件绝对路径
        private string strvideopath = "";// 视频文件的绝对路径
        private string strrecorderpath = "";// 录音文件的绝对路径

        @override
        protected void oncreate(bundle savedinstancestate) {
                super.oncreate(savedinstancestate);
                this.setcontentview(r.layout.problem_report);
        }

        @override
        protected void onactivityresult(int requestcode, int resultcode, intent data) {
                super.onactivityresult(requestcode, resultcode, data);
                switch (requestcode) {
                case result_capture_image://拍照
                        if (resultcode == result_ok) {
                                toast.maketext(this, strimgpath, toast.length_short).show();
                        }
                        break;
                case request_code_take_video://拍摄视频
                        if (resultcode == result_ok) {
                                uri urivideo = data.getdata();
                                cursor cursor=this.getcontentresolver().query(urivideo, null, null, null, null);
                                if (cursor.movetonext()) {
                                        /** _data：文件的绝对路径 ，_display_name：文件名 */
                                        strvideopath = cursor.getstring(cursor.getcolumnindex("_data"));
                                        toast.maketext(this, strvideopath, toast.length_short).show();
                                }
                        }
                        break;
                case result_capture_recorder_sound://录音
                        if (resultcode == result_ok) {
                                uri urirecorder = data.getdata();
                                cursor cursor=this.getcontentresolver().query(urirecorder, null, null, null, null);
                                if (cursor.movetonext()) {
                                        /** _data：文件的绝对路径 ，_display_name：文件名 */
                                        strrecorderpath = cursor.getstring(cursor.getcolumnindex("_data"));
                                        toast.maketext(this, strrecorderpath, toast.length_short).show();
                                }
                        }
                        break;
                }
        }

      

        /**
         * 照相功能
         */
        private void cameramethod() {
                intent imagecaptureintent = new intent(mediastore.action_image_capture);
                strimgpath = environment.getexternalstoragedirectory().tostring() + "/consdcgmpic/";//存放照片的文件夹
                string filename = new simpledateformat("yyyymmddhhmmss").format(new date()) + ".jpg";//照片命名
                file out = new file(strimgpath);
                if (!out.exists()) {
                        out.mkdirs();
                }
                out = new file(strimgpath, filename);
                strimgpath = strimgpath + filename;//该照片的绝对路径
                uri uri = uri.fromfile(out);
                imagecaptureintent.putextra(mediastore.extra_output, uri);
                imagecaptureintent.putextra(mediastore.extra_video_quality, 1);
                startactivityforresult(imagecaptureintent, result_capture_image);

        }

        /**
         * 拍摄视频
         */
        private void videomethod() {
                intent intent = new intent(mediastore.action_video_capture);
                intent.putextra(mediastore.extra_video_quality, 0);
                startactivityforresult(intent, request_code_take_video);
        }

        /**
         * 录音功能
         */
        private void soundrecordermethod() {
                intent intent = new intent(intent.action_get_content);
                intent.settype("audio/amr");
                startactivityforresult(intent, result_capture_recorder_sound);
        }

        /**
         * 提示信息
         * @param text
         * @param duration
         */
        private void showtoast(string text, int duration) {
                toast.maketext(problemreport.this, text, duration).show();
        }
}