问题
我有一个非常简单的活动,带有两个选项卡,并且我正在尝试在自定义视图中处理键盘输入。这非常有效... 直到我交换选项卡为止。一旦我交换选项卡,我就无法再捕获事件了。在另一个应用程序中,打开一个对话框然后关闭它将允许我的关键事件通过。如果不这样做,我发现没有办法再次获取我的键盘事件。
问题出在哪里?我找不到任何方法在我交换选项卡后获取按键事件,并且想知道是什么导致了这种情况。这个例子非常简短明了。
代码
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<FrameLayout
android:id="@+id/actionbar_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>
my_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<view
class="com.broken.keyboard.KeyboardTestActivity$MyView"
android:background="#777777"
android:focusable="true"
android:focusableInTouchMode="true"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<requestFocus/>
</view>
</LinearLayout>
KeyboardTestActivity.java
package com.broken.keyboard;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.app.FragmentTransaction;
import android.app.ActionBar.Tab;
import android.content.Context;
public class KeyboardTestActivity extends Activity {
public static class MyView extends View {
public void toggleKeyboard()
{ ((InputMethodManager)getContext().getSystemService(Context.INPUT_METHOD_SERVICE)).toggleSoftInput(0, 0); }
public MyView(Context context)
{ super(context); }
public MyView(Context context, AttributeSet attrs)
{ super(context, attrs); }
public MyView(Context context, AttributeSet attrs, int defStyle)
{ super(context, attrs, defStyle); }
// FIRST PLACE I TRY, WHERE I WANT TO GET THE PRESSES
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
Log.i("BDBG", "Key went down in view!");
return super.onKeyDown(keyCode,event);
}
// Toggle keyboard on touch!
@Override
public boolean onTouchEvent(MotionEvent event)
{
if ((event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN)
{
toggleKeyboard();
}
return super.onTouchEvent(event);
}
}
// Extremely simple fragment
public class MyFragment extends Fragment {
@Override
public View onCreateView (LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.my_fragment, container, false);
return v;
}
}
// Simple tab listener
public static class MyTabListener implements ActionBar.TabListener
{
private FragmentManager mFragmentManager=null;
private Fragment mFragment=null;
private String mTag=null;
public MyTabListener(FragmentManager fragmentManager, Fragment fragment,String tag)
{
mFragmentManager=fragmentManager;
mFragment=fragment;
mTag=tag;
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// do nothing
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
mFragmentManager.beginTransaction()
.replace(R.id.actionbar_content, mFragment, mTag)
.commit();
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
mFragmentManager.beginTransaction()
.remove(mFragment)
.commit();
}
}
FragmentManager mFragmentManager;
ActionBar mActionBar;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Retrieve the fragment manager
mFragmentManager=getFragmentManager();
mActionBar=getActionBar();
// remove the activity title to make space for tabs
mActionBar.setDisplayShowTitleEnabled(false);
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Add the tabs
mActionBar.addTab(mActionBar.newTab()
.setText("Tab 1")
.setTabListener(new MyTabListener(getFragmentManager(), new MyFragment(),"Frag1")));
mActionBar.addTab(mActionBar.newTab()
.setText("Tab 2")
.setTabListener(new MyTabListener(getFragmentManager(), new MyFragment(),"Frag2")));
}
// OTHER PLACE I TRY, DOESN'T WORK BETTER THAN IN THE VIEW
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
Log.i("BDBG", "Key went down in activity!");
return super.onKeyDown(keyCode,event);
}
}