如何解决记录来电时出错不起作用？
我正在拨打电话录音应用程序拨出电话正在录音，但来电未录音。我也在不同的手机上测试过，但问题是一样的。我测试了不同的方法，比如
" MediaRecorder.AudioSource.MIC ",“ MediaRecorder.AudioSource.VOICE_CALL ”，和
“MediaRecorder.AudioSource.VOICE_COMMUNICATION”。在尝试了不同的方法之后，我尝试了
myRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_UPLINK+ MediaRecorder.AudioSource.VOICE_DOWNLINK);
Main MainActivity 代码
public class MainActivity extends AppCompatActivity {
Button start_rec,stop_rec;
TextView status;
MediaRecorder myRecorder;
SimpleDateFormat dateFormat;
String currentTimeStamp;
File outputFile;
private static final int REQUEST_CODE = 0;
private DevicePolicyManager mDPM;
private ComponentName mAdminName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
start_rec = findViewById(R.id.start_rec);
stop_rec = findViewById(R.id.stop_rec);
status = findViewById(R.id.status);
try {
// Initiate DevicePolicyManager.
mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
mAdminName = new ComponentName(this,DeviceAdminDemo.class);
if (!mDPM.isAdminActive(mAdminName)) {
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,mAdminName);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"Click on Activate button to secure your application.");
startActivityForResult(intent,REQUEST_CODE);
} else {
// mDPM.lockNow();
// Intent intent = new Intent(MainActivity.this,// TrackDeviceService.class);
// startService(intent);
}
} catch (Exception e) {
e.printstacktrace();
}
start_rec.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
File sampleDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/rec2");
File data = Environment.getDataDirectory();
boolean success = true;
if (!sampleDir.exists()) {
sampleDir.mkdirs();
success = sampleDir.mkdirs();
}
if (success) {
outputFile = new File(sampleDir,getCurrentTimeStamp() + ".mp3");
myRecorder = new MediaRecorder();
myRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_UPLINK + MediaRecorder.AudioSource.VOICE_DOWNLINK);
myRecorder.setoutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
myRecorder.setAudioEncodingBitRate(16);
myRecorder.setAudioSamplingRate(44100);
myRecorder.setoutputFile(outputFile.getAbsolutePath());
try {
myRecorder.prepare();
myRecorder.start();
} catch (IllegalStateException e) {
e.printstacktrace();
} catch (IOException e) {
e.printstacktrace();
}
status.setText("Recording");
status.setTextColor(Color.GREEN);
Toast.makeText(getApplicationContext(),"Recording...",Toast.LENGTH_SHORT).show();
}
}
});
stop_rec.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
myRecorder.stop();
myRecorder.reset();
myRecorder.release();
myRecorder = null;
} catch (IllegalStateException e) {
e.printstacktrace();
} catch (RuntimeException e) {
// no valid audio/video data has been received
e.printstacktrace();
}
status.setText("Recording Stopped");
status.setTextColor(Color.RED);
Toast.makeText(getApplicationContext(),"Recording Stopped",Toast.LENGTH_SHORT).show();
// refresh();
}
});
}
@Override
protected void onActivityResult(int requestCode,int resultCode,Intent data) {
super.onActivityResult(requestCode,resultCode,data);
if (REQUEST_CODE == requestCode) {
// Intent intent = new Intent(MainActivity.this,TService.class);
// startService(intent);
}
}
public void refresh() {
Intent intent = getIntent();
finish();
startActivity(intent);
}
public String getCurrentTimeStamp() {
try {
dateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
currentTimeStamp = dateFormat.format(new Date()); // Find todays date
return currentTimeStamp;
} catch (Exception e) {
e.printstacktrace();
}
return null;
}
}
public class DeviceAdminDemo extends DeviceAdminReceiver {
@Override
public void onReceive(Context context,Intent intent) {
super.onReceive(context,intent);
}
public void onEnabled(Context context,Intent intent) {
};
public void ondisabled(Context context,Intent intent) {
};
}
清单代码
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="waceem.virk.voicerecording">
<uses-permission android:name="android.permission.RECORD_AUdio" />
<uses-permission android:name="android.permission.CAPTURE_AUdio_OUTPUT"
tools:ignore="ProtectedPermissions" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.read_external_storage" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:requestLegacyExternalStorage="true"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.VoiceRecording">
<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=".DeviceAdminDemo"
android:permission="android.permission.BIND_DEVICE_ADMIN" >
<Meta-data
android:name="android.app.device_admin"
android:resource="@xml/my_admin" />
<intent-filter>
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
<action android:name="android.app.action.DEVICE_ADMIN_disABLED" />
<action android:name="android.app.action.DEVICE_ADMIN_disABLE_REQUESTED" />
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.HOME" />
</intent-filter>
</receiver>
</application>
</manifest>
解决方法
要使用它，您需要 Manifest.permission.CAPTURE_AUDIO_OUTPUT 权限，这是系统权限。这意味着您需要由 OEM 预先安装，或者用户需要 root 其设备并知道如何将您的应用程序设为系统应用程序。
基本上 Android 不允许您这样做。您最多只能使用普通麦克风进行捕捉，并希望来电者大声说话，或者用户将其放在免提电话上。
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