我正在开发一个应用程序，通过android中的活动调用发送DTMF音调。我在我的应用程序中搜索了很多以实现此功能，我发现了这个： com.android.internal.telecom.IInCallAdapter 扩展 android.os.IInterface 的界面。在 IInCallAdapter 中有一个方法 playDtmfTone（String s，Char c），我们可以用它来通过活动呼叫发送DTMF音。我有一个活动 HelloPage.java 这样做，但在初始化 IInCallAdapter 的对象时出现 java.lang.ClassCastException 错误。我知道这个错误意味着什么，但不知道如何处理这个问题。这是我的代码：
public class HelloPage extends Activity implements View.OnClickListener{
Button DTMF_b1,DTMF_b2,DTMF_b3,DTMF_b4,DTMF_b5,DTMF_b6,DTMF_b7,DTMF_b8,DTMF_b9,DTMF_b0,DTMF_bS,DTMF_bP;
private TextView DTMFToneDialedView;
private String DTMFToneDialedNumber = "";
private String callId;
private IInCallAdapter mIInCallAdapter;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_hello_page);
mIInCallAdapter = (IInCallAdapter) this; /*I am getting error here in this line*/
DTMF_b1 = (Button) findViewById(R.id.id_playDTMF1);
DTMF_b2 = (Button) findViewById(R.id.id_playDTMF2);
DTMF_b3 = (Button) findViewById(R.id.id_playDTMF3);
DTMF_b4 = (Button) findViewById(R.id.id_playDTMF4);
DTMF_b5 = (Button) findViewById(R.id.id_playDTMF5);
DTMF_b6 = (Button) findViewById(R.id.id_playDTMF6);
DTMF_b7 = (Button) findViewById(R.id.id_playDTMF7);
DTMF_b8 = (Button) findViewById(R.id.id_playDTMF8);
DTMF_b9 = (Button) findViewById(R.id.id_playDTMF9);
DTMF_bS = (Button) findViewById(R.id.id_playDTMFStar);
DTMF_b0 = (Button) findViewById(R.id.id_playDTMF0);
DTMF_bP = (Button) findViewById(R.id.id_playDTMFPound);
callId = MainActivity.telecomCallId; //Getting telecom Call ID from a static variable in a MainActivity
DTMFToneDialedView = (TextView) findViewById(R.id.id_DTMFToneDialedKey);
DTMF_b1.setOnClickListener(this);
DTMF_b2.setOnClickListener(this);
DTMF_b3.setOnClickListener(this);
DTMF_b4.setOnClickListener(this);
DTMF_b5.setOnClickListener(this);
DTMF_b6.setOnClickListener(this);
DTMF_b7.setOnClickListener(this);
DTMF_b8.setOnClickListener(this);
DTMF_b9.setOnClickListener(this);
DTMF_bS.setOnClickListener(this);
DTMF_b0.setOnClickListener(this);
DTMF_bP.setOnClickListener(this);
}
//This method updated the screen what we dial
public void dialedNumberUpdater(String key){
DTMFToneDialedNumber = DTMFToneDialedNumber + key;
DTMFToneDialedView.setText(DTMFToneDialedNumber);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.id_playDTMF1:
try {
mIInCallAdapter.playDtmfTone(callId, '1');
dialedNumberUpdater("1");
}catch (Exception e){
dialedNumberUpdater("w"); //updating 'w' into the screen so that user can see it is not working.
}
break;
case R.id.id_playDTMF2:
try {
mIInCallAdapter.playDtmfTone(callId, '2');
dialedNumberUpdater("2");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF3:
try {
mIInCallAdapter.playDtmfTone(callId, '3');
dialedNumberUpdater("3");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF4:
try {
mIInCallAdapter.playDtmfTone(callId, '4');
dialedNumberUpdater("4");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF5:
try {
mIInCallAdapter.playDtmfTone(callId, '5');
dialedNumberUpdater("5");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF6:
try {
mIInCallAdapter.playDtmfTone(callId, '6');
dialedNumberUpdater("6");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF7:
try {
mIInCallAdapter.playDtmfTone(callId, '7');
dialedNumberUpdater("7");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF8:
try {
mIInCallAdapter.playDtmfTone(callId, '8');
dialedNumberUpdater("8");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF9:
try {
mIInCallAdapter.playDtmfTone(callId, '9');
dialedNumberUpdater("9");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMFStar:
try {
mIInCallAdapter.playDtmfTone(callId, '*');
dialedNumberUpdater("*");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMF0:
try {
mIInCallAdapter.playDtmfTone(callId, '0');
dialedNumberUpdater("0");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
case R.id.id_playDTMFPound:
try {
mIInCallAdapter.playDtmfTone(callId, '#');
dialedNumberUpdater("#");
}catch (Exception e){
dialedNumberUpdater("w");
}
break;
}
}
}
这是Logcat：
01-29 01:43:07.649 565-1247/? I/ActivityManager﹕ START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=algor7.code.backgroundcallingapp/.HelloPage} from uid 10099 on display 0
01-29 01:43:07.794 13439-13439/algor7.code.backgroundcallingapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: algor7.code.backgroundcallingapp, PID: 13439
java.lang.RuntimeException: Unable to start activity ComponentInfo{algor7.code.backgroundcallingapp/algor7.code.backgroundcallingapp.HelloPage}: java.lang.ClassCastException: algor7.code.backgroundcallingapp.HelloPage cannot be cast to android.os.IInterface
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassCastException: algor7.code.backgroundcallingapp.HelloPage cannot be cast to android.os.IInterface
at algor7.code.backgroundcallingapp.HelloPage.onCreate(HelloPage.java:39)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
01-29 01:43:07.813 565-876/? W/ActivityManager﹕ Force finishing activity algor7.code.backgroundcallingapp/.HelloPage
01-29 01:43:08.345 565-578/? W/ActivityManager﹕ Activity pause timeout for ActivityRecord{454bc33 u0 algor7.code.backgroundcallingapp/.HelloPage t191 f}
请帮我解决这个问题。提前谢谢。
答案 0 :(得分：0)
因为你的这是一个HelloPage对象。它不是IInCallAdapter，不从它继承，也不扩展它。它不能一体化。为什么你认为它可能是？
答案 1 :(得分：0)
创建一个实现IInCallAdapter的类，然后实现其所有方法
public class ClassName implements IInCallAdapter {
...
}
然后，您可以在Activity类
中创建此类的实例