在TextView方法中，如下：
@Override
public boolean onTouchEvent(MotionEvent event) {
if (touchIsFinished && (isTextEditable() || mTextIsSelectable)) {
// Show the IME, except when selecting in read-only text.
final InputMethodManager imm = InputMethodManager.peekInstance();
Log.d(TAG, "TextView class onTouchEvent method viewClicked");
viewClicked(imm);
if (!mTextIsSelectable && mSoftInputShownOnFocus) {
Log.d(TAG, "TextView class onTouchEvent method && InputMethodManager showSoftInput" );
handled |= imm != null && imm.showSoftInput(this, 0);
}
}当点击后，会打印如下日志：TextView class onTouchEvent method && InputMethodManager showSoftInput，在这之前会先进行viewClicked(imm)，进入该方法：
/**
* @hide
*/
protected void viewClicked(InputMethodManager imm) {
if (imm != null) {
Log.d(TAG, "TextView class viewClicked method InputMethodManager viewClicked");
imm.viewClicked(this);
}
}即调用imm的viewClicked方法：
/**
* Notify the event when the user tapped or clicked the text view.
*/
public void viewClicked(View view) {
final boolean focusChanged = mServedView != mNextServedView;
checkFocus();
synchronized (mH) {
if ((mServedView != view && (mServedView == null
|| !mServedView.checkInputConnectionProxy(view)))
|| mCurrentTextBoxAttribute == null || mCurMethod == null) {
return;
}
try {
if (DEBUG) Log.v(TAG,"InputMethodManager class " + "onViewClicked: " + focusChanged);
mCurMethod.viewClicked(focusChanged);
} catch (RemoteException e) {
Log.w(TAG,"InputMethodManager class " + "IME died: " + mCurId, e);
}
}
}
@Override
public void viewClicked(boolean focusChanged) {
Log.d(TAG, "viewClicked focusChanged=" + focusChanged);
if (!isEnabled()) {
Log.d(TAG, "viewClicked isEnabled false");
return;
}
InputMethodService.this.onViewClicked(focusChanged);
}通过日志：InputMethodManager class onViewClicked: false来看，focusChanged为false，当前的mCurMethod为InputMethodService，所以我们进入到如下
return mService.showSoftInput(mClient, flags, resultReceiver); @Override
public boolean showSoftInput(IInputMethodClient client, int flags,
ResultReceiver resultReceiver) {
Slog.d(TAG,"InputMethodManagerService class showSoftInput method ");
int uid = Binder.getCallingUid();
long ident = Binder.clearCallingIdentity();
try {
synchronized (mMethodMap) {
if (mCurClient == null || client == null
|| mCurClient.client.asBinder() != client.asBinder()) {
try {
// We need to check if this is the current client with
// focus in the window manager, to allow this call to
// be made before input is started in it.
if (!mIWindowManager.inputMethodClientHasFocus(client)) {
Slog.w(TAG, "InputMethodManagerService class" + "Ignoring showSoftInput of uid " + uid + ": " + client);
return false;
}
} catch (RemoteException e) {
return false;
}
}
if (DEBUG) Slog.v(TAG, "InputMethodManagerService class" + "Client requesting input be shown");
return showCurrentInputLocked(flags, resultReceiver);
}
} finally {
Binder.restoreCallingIdentity(ident);
}
}打印了如下两行日志：
04-24 15:38:46.160 D/PateoInputMethod( 1221): InputMethodManagerService class showSoftInput method
04-24 15:38:46.160 V/PateoInputMethod( 1221): InputMethodManagerService classClient requesting input be shown
进入showCurrentInputLocked方法，如下：
boolean showCurrentInputLocked(int flags, ResultReceiver resultReceiver) {
Slog.d(TAG,"InputMethodManagerService class showCurrentInputLocked method ");
mShowRequested = true;
if ((flags&InputMethodManager.SHOW_IMPLICIT) == 0) {
mShowExplicitlyRequested = true;
}
if ((flags&InputMethodManager.SHOW_FORCED) != 0) {
mShowExplicitlyRequested = true;
mShowForced = true;
}
if (!mSystemReady) {
return false;
}
boolean res = false;
if (mCurMethod != null) {
Slog.d(TAG,"InputMethodManagerService class executeOrSendMessage method mCurMethod=" + mCurMethod.getClass().getName());
executeOrSendMessage(mCurMethod, mCaller.obtainMessageIOO(
MSG_SHOW_SOFT_INPUT, getImeShowFlags(), mCurMethod,
resultReceiver));
mInputShown = true;
if (mHaveConnection && !mVisibleBound) {
mContext.bindService(mCurIntent, mVisibleConnection, Context.BIND_AUTO_CREATE);
mVisibleBound = true;
}
res = true;相应的日志：
04-24 15:38:46.160 D/PateoInputMethod( 1221): InputMethodManagerService class showCurrentInputLocked method
04-24 15:38:46.160 D/PateoInputMethod( 1221): InputMethodManagerService class executeOrSendMessage method mCurMethod=com.android.internal.view.IInputMethod$Stub$Proxy
从日志来看是走入了如下代码：
executeOrSendMessage(mCurMethod, mCaller.obtainMessageIOO(
MSG_SHOW_SOFT_INPUT, getImeShowFlags(), mCurMethod,
resultReceiver));
public Message obtainMessageIOO(int what, int arg1, Object arg2, Object arg3) {
SomeArgs args = obtainArgs();
args.arg1 = arg2;
args.arg2 = arg3;
return mH.obtainMessage(what, arg1, 0, args);
}这里需要说明下，mCurMethod这个变量是InputMethodService【注意点二】，这个mCurMethod被封装到消息msg中了，后续执行消息的时候需要去除这个对象调用相应的方法：
case MSG_SHOW_SOFT_INPUT:
Slog.d(TAG,"InputMethodManagerService class MSG_SHOW_SOFT_INPUT msg ");
args = (HandlerCaller.SomeArgs)msg.obj;
try {
((IInputMethod)args.arg1).showSoftInput(msg.arg1,
(ResultReceiver)args.arg2);
} catch (RemoteException e) {
}从上面看很明显，之前的mCurMethod对象即为msg.arg1，现在调用mCurMethod的showSoftInput方法，即调用InputMethodService的如下方法
/**
* Handle a request by the system to show the soft input area.
*/
public void showSoftInput(int flags, ResultReceiver resultReceiver) {
if (DEBUG) Log.v(TAG,"InputMethodService class" + "showSoftInput()");
boolean wasVis = isInputViewShown();
mShowInputFlags = 0;
if (onShowInputRequested(flags, false)) {
showWindow(true);
}
// If user uses hard keyboard, IME button should always be shown.
boolean showing = onEvaluateInputViewShown();
mImm.setImeWindowStatus(mToken, IME_ACTIVE | (showing ? IME_VISIBLE : 0),
mBackDisposition);
if (resultReceiver != null) {
resultReceiver.send(wasVis != isInputViewShown()
? InputMethodManager.RESULT_SHOWN
: (wasVis ? InputMethodManager.RESULT_UNCHANGED_SHOWN
: InputMethodManager.RESULT_UNCHANGED_HIDDEN), null);
}从上面来看mImm为InputMethodManager，即InputMethodService也有这么一个属性对象InputMethodService，还有上面的方法showSoftInput是在InputMethodService的内部类 public class InputMethodImpl extends AbstractInputMethodImpl 中的，跟踪一下：
public abstract class AbstractInputMethodImpl implements InputMethod ，AbstractInputMethodService是抽象类，InputMethodService集成于AbstractInputMethodImpl，其次public interface InputMethod
到现在基本清晰一点了，但是上面有几个对象变量是直接说明的，它们又是什么时候初始化的呢？需要进一步跟踪，即如下：
InputMethodManager类中的mService是InputMethodManagerService 【注意点一】
它的定义： final IInputMethodManager mService;
我进行了grep下，寻找相应的aidl对应骨架代理类
pateo@pateo-B86N53X:/work/project/a1001eh/frameworks/base/services/java$ grep -r "IInputMethodManager.Stub" ./
./com/android/server/InputMethodManagerService.java:public class InputMethodManagerService extends IInputMethodManager.Stub InputMethodManager(IInputMethodManager service, Looper looper) {
mService = service;
mMainLooper = looper;
mH = new H(looper);
mIInputContext = new ControlledInputConnectionWrapper(looper,
mDummyInputConnection, this);
if (mInstance == null) {
mInstance = this;
}
}跟踪其在哪里被调用的？原来在它的单例的构造获取方法中
/**
* Internally, the input method manager can't be context-dependent, so
* we have this here for the places that need it.
* @hide
*/
static public InputMethodManager getInstance(Looper mainLooper) {
synchronized (mInstanceSync) {
if (mInstance != null) {
return mInstance;
}
IBinder b = ServiceManager.getService(Context.INPUT_METHOD_SERVICE);
IInputMethodManager service = IInputMethodManager.Stub.asInterface(b);
mInstance = new InputMethodManager(service, mainLooper);
}
return mInstance;
} try {
Slog.i(TAG, "Input Method Service");
imm = new InputMethodManagerService(context);
ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm);
} catch (Throwable e) {
reportWtf("starting Input Manager Service", e);
}这个先到这里，我们再看 ：mCurMethod这个变量是InputMethodService【注意点二】
即InputMethodManagerService类中的mCurMethod，如下定义：
/**
* If non-null, this is the input method service we are currently connected
* to.
*/
IInputMethod mCurMethod;它又是在哪里被初始化的呢？
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
synchronized (mMethodMap) {
if (mCurIntent != null && name.equals(mCurIntent.getComponent())) {
mCurMethod = IInputMethod.Stub.asInterface(service);我进行了grep ，我们来看一下：
pateo@pateo-B86N53X:/work/project/a1001eh/frameworks/base$ grep -r "IInputMethod.Stub" ./
./core/java/android/inputmethodservice/IInputMethodWrapper.java:class IInputMethodWrapper extends IInputMethod.Stub
./services/java/com/android/server/InputMethodManagerService.java: mCurMethod = IInputMethod.Stub.asInterface(service);
好吧，我们来看一下IInputMethodWrapper？跟踪这个类在哪被初始化
@Override
final public IBinder onBind(Intent intent) {
if (mInputMethod == null) {
mInputMethod = onCreateInputMethodInterface();
}
return new IInputMethodWrapper(this, mInputMethod);
} /**
* Called by the framework during initialization, when the InputMethod
* interface for this service needs to be created.
*/
public abstract AbstractInputMethodImpl onCreateInputMethodInterface();上面这个方法在AbstractInputMethodService类中，而AbstractInputMethodService这个类是这样的关系如下：
public class InputMethodService extends AbstractInputMethodService
现在明白了吧？我们回到上面，如下：
case MSG_SHOW_SOFT_INPUT:
Slog.d(TAG,"InputMethodManagerService class MSG_SHOW_SOFT_INPUT msg ");
args = (HandlerCaller.SomeArgs)msg.obj;
try {
((IInputMethod)args.arg1).showSoftInput(msg.arg1,
(ResultReceiver)args.arg2);
} catch (RemoteException e) {
}我们看到IInputMethodWrapper的showSoftInput的方法：
public void showSoftInput(int flags, ResultReceiver resultReceiver) {
mCaller.executeOrSendMessage(mCaller.obtainMessageIO(DO_SHOW_SOFT_INPUT,
flags, resultReceiver));
}而上面这个DO_SHOW_SOFT_INPUT消息又是做了什么？
case DO_SHOW_SOFT_INPUT:
inputMethod.showSoftInput(msg.arg1, (ResultReceiver)msg.obj); public void executeMessage(Message msg) {
InputMethod inputMethod = mInputMethod.get();跟踪mInputMethod这个又是哪里初始化的？
public IInputMethodWrapper(AbstractInputMethodService context,
InputMethod inputMethod) {
mTarget = new WeakReference<AbstractInputMethodService>(context);
mCaller = new HandlerCaller(context.getApplicationContext(), this);
mInputMethod = new WeakReference<InputMethod>(inputMethod);
mTargetSdkVersion = context.getApplicationInfo().targetSdkVersion;
}看到上面明白了吧，构造函数里面赋值的，不就是上面之前分析的：
@Override
final public IBinder onBind(Intent intent) {
if (mInputMethod == null) {
mInputMethod = onCreateInputMethodInterface();
}
return new IInputMethodWrapper(this, mInputMethod);
}现在你应该能明白了
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