I have an app start by Splash activity screen for 5 seconds Then open Login activity screen then after you put correct user and password open the Menu activity (listActivity) then each row click open MyCity activity.
UPDATE:
What I’m trying to get is: where ever you are in my app, and you go away from my app for any reason not only when you press the home button but also FOR EXAMPLES:
-
You press home button to check another app then want to return to my app .
-
You have notification show new message on whatsup or email, you open your whatsup or open email, then return to my app .
3- You left your mobile for period of time then you want to check my app again .
4- you press power button to close the phone ( lock the screen) , then open the lock and want to return back to my app .
what I mean any time you go away my app for any reason but whithout press back back back button which will exit the whole app
then want to return again to my app must open to
you the login screen to re enter your usename and password again.
I Called finish(); for both Splash activity and Login activity .
I tried:android:clearTaskOnLaunch="true" in the Login activity in the manifest but it doesn’thing.
Any advice will be appreciated,
PLEASE WRITE FULL WORKING CODE.
LOGIN ACTIVITY:
public class Login extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
Button b = (Button) findViewById(R.id.loginbutton);
b.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
EditText username = (EditText) findViewById(R.id.login);
EditText password = (EditText) findViewById(R.id.password);
if(username.getText().toString().length() > 0 && password.getText().
toString().length() > 0 ) {
if(username.getText().toString().equals("test") && password.getText().
toString().equals("test")) {
Intent intent = new Intent(Login.this, Menu.class);
startActivity(intent);
finish(); }
} }
}); } }
Menu Activity :
public class Menu extends ListActivity {
String classes[] = { "City1", "City2", "City3", "City4", "City5"};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(Menu.this,
android.R.layout.simple_list_item_1, classes));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
String cheese = classes[position];
try {
Class ourClass = Class.forName("com.test.demo.MyCity");
Intent ourIntent = new Intent(Menu.this, ourClass);
ourIntent.putExtra("cheese", cheese);
startActivity(ourIntent);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}}
MyCity Activity :
public class MyCity extends Activity {
TextView tv1;
String city;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.city);
initializeTextViews();}
private void initializeTextViews() {
tv1=(TextView)findViewById(R.id.city_tv);
city=getIntent().getStringExtra("cheese");
if(city.equalsIgnoreCase("City1")){
tv1.setText(Html.fromHtml(getString(R.string.city1)));}
else if(city.equalsIgnoreCase("City2")){
tv1.setText(Html.fromHtml(getString(R.string.city2)));}
else if(city.equalsIgnoreCase("City3")){
tv1.setText(Html.fromHtml(getString(R.string.city3)));}
else if(city.equalsIgnoreCase("City4")){
tv1.setText(Html.fromHtml(getString(R.string.city4)));}
else if(city.equalsIgnoreCase("City5")){
tv1.setText(Html.fromHtml(getString(R.string.city5)));}
}}
MY MANIFEST:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test.demo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Splash"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Login"
android:label="@string/app_name"
android:clearTaskOnLaunch="true">
<intent-filter>
<action android:name="com.test.demo.LOGIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Menu"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.test.demo.MENU" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".MyCity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.test.demo.MYCITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
SECOND UPDATE : i reached halfway to what i want but still some steps i can’t achieve it explained as below :
BY applying android:clearTaskOnLaunch="true" to Splash activity ,
and prevent back button behaviour on Menu activity :
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
moveTaskToBack(true);
return true;
}
return super.onKeyDown(keyCode, event);
} }
SO now when press home button away my app then return to my app its:
go directly to Login activity.
but main goal now is :
if :
SCREEN LOCKED when you are away from your mobile , or press lightly the power button to lock the phone .
or
OPENED MESSAGE from notification
or
OPENED EMAIL from notification
or
you have CALL and answer it ,
THEN return to my app it does not go to login activity but you will return to the page where you was befor .
ANY ADVICE PLEASE , THANKS.
THIED UPDATE :
i used another code for override home button and control the back button rather than appling :android:clearTaskOnLaunch="true" to Splash activity in manifest , just apply the down code to Menu activity:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
moveTaskToBack(true);
return true;}
else if (keyCode == KeyEvent.KEYCODE_HOME) {
Intent i=new Intent(Menu.this,Login.class);
startActivity(i);
finish();
return true;}
return super.onKeyDown(keyCode, event);}
Here is the solution I came up with.
Please Download the project at the end of the blog post and test it.
Tested on:
The basic idea: We will create a RequireLoginActivity which will be extended by all our activities except the LoginActivity.
Three cases should be captured when the onResume function is called:
The basic idea of my solution is to have 2 counters: number of Started activities (startCounter) and number of Paused activities (pauseCounter). Each time an activity starts we will increment startCounter. Similarly, when an activity pauses, pauseCounter should be incremented. In our onResume function, we will decide whether to go to the Sign in by comparing the 2 counters. We will gotoLogin() if the 2 counters are equal!
Let me explain:
At any time, case 1 can be captured simply because upon starting new activities, our startCounter will always be greater that pauseCounter by 1. This is true because we will always have one extra activity started but not paused.
Also, case 3 is easily captured, because once you leave our app, say, using the HOME button, we will increment the pauseCounter and the 2 counters will become equal. Once the app is resumed, the onResume will decide to gotoLogin().
Case 2 is a bit tricky, but simple as well. The trick is by overriding the finish() function and decrementing the startCounter once and the pauseCounter twice in it. Remember that when finishing the activity, onPause is called and our counters are equal. Now by decrementing startCounter once and pauseCounter twice, we ultimately returned to the counters’ values of the previous activity, and startCounter will remain greater the pauseCounter by 1 when the previous activity resumes.