Broadcast receiver stops after doing its task

Question 1

Make your recorder as the static member(private static MediaRecorder recorder;)
You have to release recorder after calling recorder.stop() recorder.release();

Here is the edited code:

package com.example.callreceiver;

import java.io.File;
import java.io.IOException;
import java.util.Timer;
import java.util.logging.Handler;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;

public class CallReceiver extends BroadcastReceiver {    

    private static MediaRecorder recorder;
    private File audiofile;
    private String name, phonenumber;
    private String audio_format;
    private String Audio_Type;
    private int audioSource;
    private Context context;
    private Handler handler;
    private Timer timer;
    private Boolean offHook = false, ringing = false;
    private Toast toast;
    private Boolean isOffHook = false;
    private static boolean recordstarted = false;
    private static boolean wasRinging = false;

    private static final String ACTION_IN = "android.intent.action.PHONE_STATE";
    private static final String ACTION_OUT = "android.intent.action.NEW_OUTGOING_CALL";

    private Bundle bundle;
    private String state;
    private String inCall, outCall;

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("onReceive", "Receive successfully");

        if (intent.getAction().equals(ACTION_IN)) {
            Log.i("onReceive", "ACTION IN");
            if ((bundle = intent.getExtras()) != null) {
                Log.i("onReceive", "Bundle != NULL");
                state = bundle.getString(TelephonyManager.EXTRA_STATE);
                Log.i("onReceive", "state:"+state);
                if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
                    Log.i("onReceive", "Phone ringing");
                    inCall = bundle
                            .getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
                    wasRinging = true;
                    Toast.makeText(context, "IN : " + inCall, Toast.LENGTH_LONG)
                            .show();
                } else if (state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)) {
                    Log.i("onReceive", "Phone off hook ");
                    if (wasRinging == true) {
                        Log.i("onReceive", "Phone was ringing");
                        Toast.makeText(context, "ANSWERED", Toast.LENGTH_LONG)
                                .show();

                        File sampleDir = new File(
                                Environment.getExternalStorageDirectory(),
                                "/TestRecordingDasa");
                        if (!sampleDir.exists()) {
                            sampleDir.mkdirs();
                        }
                        String file_name = "Rec";
                        try {
                            audiofile = File.createTempFile(file_name, ".amr",
                                    sampleDir);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        String path = Environment.getExternalStorageDirectory()
                                .getAbsolutePath();

                        recorder = new MediaRecorder();
                        recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_COMMUNICATION);
                        recorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
                        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                        recorder.setOutputFile(audiofile.getAbsolutePath());
                        try {
                            recorder.prepare();
                            Log.i("onReceive", "Prepared");
                        } catch (IllegalStateException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        recordstarted = true;
                        Log.i("onReceive", "Start recording");
                        recorder.start();
                    }
                } else if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)) {
                    Log.i("onReceive", "State idle");
                    wasRinging = false;
                    Toast.makeText(context, "REJECT || DISCO",
                            Toast.LENGTH_LONG).show();
                    if (recordstarted) {
                        recorder.stop();
                        recorder.release();
                        Log.i("onReceive", "Record Stopped");
                        recordstarted = false;
                    }
                }
            }
        } else if (intent.getAction().equals(ACTION_OUT)) {
            Log.i("onReceive", "ACTION_OUT");
            if ((bundle = intent.getExtras()) != null) {
                outCall = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
                Toast.makeText(context, "OUT : " + outCall, Toast.LENGTH_LONG)
                        .show();
            }
        }


    }

}

Question 2

it records the call but after recording the application crashes.
I get the message that Unfortunately application has stopped

In your code, when it gets offhook state it start recording but it blocks the on the function on "recorder.start();" and when Idle state broadcast then it crashes.

So, there are two things you can do:

-> Put your recording code start and stop both in different thread and handle accordingly.

Or

-> Make a service, put your start and stop recording code there. You can send broadcast to service when these call state Idle, offhook you get then start and stop recording accordingly.

Question 3

You have created an instance in if else part recorder = new MediaRecorder(); try to put this statement out side & make it globle this might solve your issue.

I have faced same issue.

The problem is you are instantiating a new MediaRecorder inside your if statement which is masking the MediaRecorder mRecorder class member. So Change: