我想在按下后退按钮时向用户显示警告对话框。例如:您确定要退出吗?。我在创建警告对话框时没有问题。我有调用此对话框方法()的问题。
这是我的HomeScreen.java
public class HomeScreen extends TabActivity {
ConferenceOpenHelper helper_ob;
Cursor cursorHome;
ProfileEditScreen profileEditScreen;
ConferenceAdapter adapter;
EcMeeting meeting;
final Context context = this;
public static int HOMETEMP = 1;// Constant for Deleting the last created id
// in edit profile screen (Cancel)
public static String HOME = "home";// constant for updating status column
public static String CUSTOM_DIALER = "custom";
public static String TEMPLATE = "template";// constant for updating status // column
public static TabHost tabHost;
public static final int QUICK_START = 1;// Constant for menu options
public static final int TEMPLATE_SCREEN = 2;// Constant for menu options
public static final int USER_GUIDE = 3;// Constant for menu options
public static final int QUICK_CALL = 4;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab);
Resources ressources = getResources();
tabHost = getTabHost();
// Android tab
Intent photo = new Intent().setClass(this,EcMeeting.class);
TabSpec tabSpecphoto = tabHost
.newTabSpec("Calendar")
.setIndicator("Calendar", ressources.getDrawable(R.drawable.calendartab))
.setContent(photo);
// Apple tab
Intent intentApple = new Intent().setClass(this,CallListScreen.class);
TabSpec tabSpecApple = tabHost
.newTabSpec("Calls")
.setIndicator("Calls", ressources.getDrawable(R.drawable.ic_action_device_access_call))
.setContent(intentApple);
// Windows tab
Intent intentWindows = new Intent().setClass(this,UserSettingActivity.class);
TabSpec tabSpecWindows = tabHost
.newTabSpec("Settings")
.setIndicator("Settings", ressources.getDrawable(R.drawable.ic_action_setting))
.setContent(intentWindows);
// add all tabs
tabHost.addTab(tabSpecphoto);
tabHost.addTab(tabSpecApple);
tabHost.addTab(tabSpecWindows);
//set Windows tab as default (zero based)
/*tabHost.setCurrentTab(0);*/
for(int i=0;i<tabHost.getTabWidget().getChildCount();i++)
{
tabHost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#d3d3d3"));
}
tabHost.getTabWidget().setCurrentTab(0);
/*tabHost.getTabWidget().getChildAt(0).setBackgroundColor(Color.parseColor("#C35817"));*/
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, QUICK_START, 0, "Quick Start").setIcon(R.drawable.ic_menu_add_icon);
menu.add(0, USER_GUIDE, 0, "User Guide").setIcon(R.drawable.ic_menu_guide_icon);
return true;
}
@Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
HomeScreen.this.finish();
}
})
.setNegativeButton("No", null)
.show();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch (item.getItemId()) {
case QUICK_START:
startActivity(new Intent(this, ConfDialerScreen.class));
break;
case USER_GUIDE:
startActivity(new Intent(this, UserGuideScreen.class));
break;
}
return true;
}
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
for(int i=0;i<tabHost.getTabWidget().getChildCount();i++)
{
tabHost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#8A4117"));
}
tabHost.getTabWidget().getChildAt(tabHost.getCurrentTab()).setBackgroundColor(Color.parseColor("#C35817"));
}
}
这是创建警告对话框的方法()
@Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
HomeScreen.this.finish();
}
})
.setNegativeButton("No", null)
.show();
}
现在,我真的不知道在哪里称这种方法。有人可以提出任何想法吗?
当用户按下后退按钮时,我想显示警告对话框。
答案 0 :(得分:3)
尝试以下代码:
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
dialogOnBackPress();
return true;
}
return super.onKeyDown(keyCode, event);
}
protected void dialogOnBackPress() {
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
HomeScreen.this.finish();
}
})
.setNegativeButton("No", null)
.show();
}
答案 1 :(得分:1)
使用此:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Alert Message:");
builder.setMessage("Do you want to save this image to your file??");
builder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
// do your stuff
}
});
builder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
finish();
}
});
AlertDialog alert = builder.create();
alert.show();
return true;
}
return super.onKeyDown(keyCode, event);
}
答案 2 :(得分:0)
您可以将此代码修改为acc。要求。
dialog.setOnKeyListener(new Dialog.OnKeyListener() {
@Override
public boolean onKey(DialogInterface arg0, int keyCode,
KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
dialog.dismiss();
}
return true;
}
});
答案 3 :(得分:0)
请勿在{{1}}
中致电super.onBackPressed();
答案 4 :(得分:0)
另外,你可以简单地在activity_main.xml(tab.xml)中添加onBackPressed()
机器人:的onClick = “onBackPressed” 在你的按钮属性中提到它