我在我的应用中使用了标签。标签工作正常。单击选项卡后，选项卡下会显示特定活动。其中一个选项卡具有菜单功能，当我单击菜单选项卡时，菜单列表将显示在选项卡下方。当我点击菜单列表时，我使用View来显示选项卡下的活动。问题从这里开始，当我点击菜单列表时，一旦活动出现，我就无法使用手机中的后退按钮。当我点击后退按钮时，它会杀死应用程序而不是返回菜单列表。以下是我的代码。
TabActivity
public class NfcSurveyActivity extends TabActivity {
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters,
mTechLists);
int profileCount = db.getContactsCount();
if (profileCount <= 0) {
Intent intent = new Intent(getApplicationContext(),
LoginActivity.class);
startActivity(intent);
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
int profileCount = db.getContactsCount();
if (profileCount <= 0) {
Intent intent1 = new Intent(getApplicationContext(),
LoginActivity.class);
startActivity(intent1);
}
Bundle extras = getIntent().getExtras();
if (extras != null) {
tabToDisplay = extras.getString("tab");
if (tabToDisplay.equals("CAMERA")) {
barcodeData = extras.getString("barcodeData");
}
extras.clear();
}
TabHost tabHost = getTabHost();
// Home
TabSpec tbspecHome = tabHost.newTabSpec("Home");
tbspecHome.setIndicator("",
getResources().getDrawable(R.drawable.tab_account_style));
Intent iHome = new Intent(this, HomeActivity.class);
tbspecHome.setContent(iHome);
tabHost.addTab(tbspecHome);
// History
tabHost.addTab(tabHost
.newTabSpec("Fun")
.setIndicator("",
getResources().getDrawable(R.drawable.tab_fun_style))
.setContent(
new Intent(this, NfcSurveyActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)));
if (tabToDisplay != null && tabToDisplay.equals("REDEEM")) {
if (barcodeData != null && barcodeData.length() > 0) {
tabHost.addTab(tabHost
.newTabSpec("Camera")
.setIndicator(
"",
getResources().getDrawable(
R.drawable.tab_redeem_style))
.setContent(
new Intent(this, NfcSurveyActivity.class)
.addFlags(
Intent.FLAG_ACTIVITY_CLEAR_TOP)
.putExtra("autoLoadBarcodeData",
barcodeData)));
}
else {
tabHost.addTab(tabHost
.newTabSpec("Camera")
.setIndicator(
"",
getResources().getDrawable(
R.drawable.tab_redeem_style))
.setContent(
new Intent(this, NfcSurveyActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)));
}
} else {
tabHost.addTab(tabHost
.newTabSpec("Camera")
.setIndicator(
"",
getResources().getDrawable(
R.drawable.tab_redeem_style))
.setContent(
new Intent(this, NfcSurveyActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)));
}
// tabHost.setCurrentTab(2);
tabHost.getTabWidget().getChildAt(2).getLayoutParams().height = tabHost
.getTabWidget().getChildAt(2).getLayoutParams().height + 19;
// Search
TabSpec tbspecSearch = tabHost.newTabSpec("Finder");
tbspecSearch.setIndicator("",
getResources().getDrawable(R.drawable.tab_finder_style));
Intent iSearch = new Intent(this, NfcSurveyActivity.class);
tbspecSearch.setContent(iSearch);
tabHost.addTab(tbspecSearch);
// Profile
TabSpec tbspecProfile = tabHost.newTabSpec("Quit");
tbspecProfile.setIndicator("",
getResources().getDrawable(R.drawable.tab_quit_style));
Intent iProfile = new Intent(this, NfcSurveyActivity.class);
tbspecProfile.setContent(iProfile);
tabHost.addTab(tbspecProfile);
for (int i = 0; i <= 4; i++) {
tabHost.getTabWidget()
.getChildTabViewAt(i)
.setBackgroundColor(
getResources()
.getColor(android.R.color.transparent));
if (i == 2) {
tabHost.getTabWidget()
.getChildTabViewAt(i)
.setPadding(
tabHost.getTabWidget().getChildTabViewAt(i)
.getPaddingLeft(),
tabHost.getTabWidget().getChildTabViewAt(i)
.getPaddingTop(),
tabHost.getTabWidget().getChildTabViewAt(i)
.getPaddingRight(), 20);
}
}
if (tabToDisplay != null && tabToDisplay.length() > 0) {
if (tabToDisplay.equals("CAMERA")) {
tabHost.setCurrentTab(2);
} else if (tabToDisplay.equals("HISTORY")) {
tabHost.setCurrentTab(1);
}
}
tabHost.setOnTabChangedListener(new OnTabChangeListener() {
public void onTabChanged(String tabId) {
NfcSurveyConfiguration.SelectedTab = tabId;
}
});
}
}
MenuActivity
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_item_row);
initList();
// We get the ListView component from the layout
ListView lv = (ListView) findViewById(R.id.listView);
simpleAdpt = new SimpleAdapter(this, planetsList,
android.R.layout.simple_list_item_1, new String[] { "planet" },
new int[] { android.R.id.text1 });
lv.setAdapter(simpleAdpt);
// React to user clicks on item
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parentAdapter, View view,
int position, long id) {
TextView clickedView = (TextView) view;
String menu = clickedView.getText().toString();
if (menu.equalsIgnoreCase("Point History")) {
View view1 = getLocalActivityManager().startActivity(
"ReferenceName",
new Intent(getApplicationContext(),
PointsHistory.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
.getDecorView();
setContentView(view1);
}
else
{
View view1 = getLocalActivityManager().startActivity(
"ReferenceName",
new Intent(getApplicationContext(),
LoginActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
.getDecorView();
setContentView(view1);
}
}
});
}
答案 0 :(得分：0)
你可以尝试添加onkeydown方法，然后尝试做你想做的事情
public boolean onKeyDown(int keyCode, KeyEvent event)
{
//Handle the back button
if( keyCode == KeyEvent.KEYCODE_BACK && isTaskRoot())
{
//ur code here to do the required step either to exit the app or stay in there
}
return true;
}
答案 1 :(得分：0)
尝试使用包含您调用的活动列表的ActivityGroup，您需要处理Multiple Activities in TabActivity。另请阅读tab group activity
OR
您可以覆盖后退按钮并完成活动，保留已打开的活动列表，并在后面按下使用开始活动打开活动以及列表结束时完成标签活动
答案 2 :(得分：0)
你可以这样使用
public void onBackPressed() {
};
当活动检测到用户按下后退键时调用。默认实现只是完成当前活动，但您可以覆盖它以执行任何操作。