由于 API 23 是可能的，请参阅 Replacing default Phone app on Android 6 and 7 with InCallService arekolek。
Kotlin 版本：Simple Phone
Java 版本：Simple Phone Dialer
编辑
按照推荐，下面是最简单的java版本。
下面显示了 Manifest，需要 intent-filter。
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.aliton.customphonecall">
<uses-permission android:name="android.permission.CALL_PHONE" />
<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>
<activity
android:name=".DialerActivity" >
<intent-filter>
<!-- Handle links from other applications -->
<action android:name="android.intent.action.VIEW" />
<action android:name="android.intent.action.DIAL" />
<!-- Populate the system chooser -->
<category android:name="android.intent.category.DEFAULT" />
<!-- Handle links in browsers -->
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="tel" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.DIAL" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<service
android:name=".CallService"
android:permission="android.permission.BIND_INCALL_SERVICE">
<meta-data
android:name="android.telecom.IN_CALL_SERVICE_UI"
android:value="true" />
<intent-filter>
<action android:name="android.telecom.InCallService" />
</intent-filter>
</service>
<activity android:name=".CallActivity"></activity>
</application>
</manifest>
MainActivity 只是有一个 Button 和一个 Intent 重定向到 DialerActivity。
下面是DialerActivity。在此 Activity 中，您将应用设置为默认应用，以便使用您的 UI 进行调用。
public class DialerActivity extends AppCompatActivity {
private static final int REQUEST_CALL_PHONE = 10;
EditText phoneNumber;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dialer);
phoneNumber = (EditText) findViewById(R.id.etNumber);
Button bCall = (Button) findViewById(R.id.btnCall);
offerReplacingDefaultDialer();
bCall.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
makeCall();
}
});
}
private void makeCall() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED) {
Uri uri = Uri.parse("tel:"+phoneNumber.getText().toString().trim());
Intent Call = new Intent(Intent.ACTION_CALL, uri);
//Toast.makeText(this, "Entered makeCall()", Toast.LENGTH_SHORT).show();
Log.i("debinf Dialer", "Entered makeCall()");
startActivity(Call);
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CALL_PHONE}, REQUEST_CALL_PHONE);
}
}
private void offerReplacingDefaultDialer() {
if (getSystemService(TelecomManager.class).getDefaultDialerPackage() != getPackageName()) {
Intent ChangeDialer = new Intent(TelecomManager.ACTION_CHANGE_DEFAULT_DIALER);
ChangeDialer.putExtra(TelecomManager.EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME, getPackageName());
startActivity(ChangeDialer);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CALL_PHONE) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
makeCall();
} else {
Toast.makeText(this, "calling permission denied", Toast.LENGTH_LONG).show();
}
//return;
}
}
}
下面是如何实现InCallService 来管理调用。
public class CallService extends InCallService {
OngoingCallObject ongoingCallObject;
@Override
public void onCallAdded(Call call) {
super.onCallAdded(call);
new OngoingCallObject().setCall(call);
//Intent CallAct = new Intent(this, CallActivity.class);
//startActivity(CallAct);
CallActivity.start(this, call);
}
@Override
public void onCallRemoved(Call call) {
super.onCallRemoved(call);
new OngoingCallObject().setCall(null);
}
}
这是对象的实现方式。
public class OngoingCallObject {
private static Call call;
private Object callback = new Callback() {
@Override
public void onStateChanged(Call call, int state) {
super.onStateChanged(call, state);
Log.i("debinf OngoingObj", "state is "+state);
}
};
public void setCall(Call call) {
if (this.call != null) {
this.call.unregisterCallback((Call.Callback)callback);
}
if (call != null) {
call.registerCallback((Call.Callback)callback);
Log.i("debinf OngoingObj", "call.getState() is "+call.getState());
}
this.call = call;
}
public void answer() {
//assert this.call != null;
if (this.call != null) {
this.call.answer(VideoProfile.STATE_AUDIO_ONLY);
}
}
public void hangup() {
//assert this.call != null;
if (this.call != null) {
this.call.disconnect();
}
}
}
最后，CallActivity 是您启动 UI 的地方。
public class CallActivity extends AppCompatActivity {
TextView callInfo;
Button answer, hangup;
private String number;
private OngoingCallObject ongoingCall;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call);
ongoingCall = new OngoingCallObject();
answer = (Button) findViewById(R.id.answer);
hangup = (Button) findViewById(R.id.hangup);
callInfo = (TextView) findViewById(R.id.callInfo);
number = Objects.requireNonNull(getIntent().getData().getSchemeSpecificPart());
callInfo.setText("Calling number : "+number);
answer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Toast.makeText(CallActivity.this, "Answer button", Toast.LENGTH_SHORT).show();
ongoingCall.answer();
}
});
hangup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ongoingCall.hangup();
}
});
}
public static void start(Context context, Call call) {
Intent intent = new Intent(context, CallActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(call.getDetails().getHandle());
context.startActivity(intent);
}
}
这是DialerActivity 的xml：activity_dialer.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".DialerActivity">
<EditText
android:id="@+id/etNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Tel number"/>
<Button
android:id="@+id/btnCall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="CallActivity"
android:layout_below="@+id/etNumber" />
</RelativeLayout>
这是CallActivity 的xml：activity_call.xml
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CallActivity">
<TextView
android:id="@+id/callInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.3"
tools:text="Hello World!" />
<Button
android:id="@+id/answer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Answer"
app:layout_constraintBaseline_toBaselineOf="@+id/hangup"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/hangup" />
<Button
android:id="@+id/hangup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hang up"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/answer"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/callInfo" />
</android.support.constraint.ConstraintLayout>
希望对你有帮助！