Today I will show you how to close all views in android in a single click of a button.
Basically if you open a number of activities, each activity is stacked one above the other like a stack if you are not calling finish() on each activity.
But there is a way to close all these activities at once by clearing the stack.
Here is a simple in which it has two activities and after navigating to the second view, the button click will open the first activity and clear the stack.
CloseAllViews.java – This is the first activity.
main.xml
Second.java – Second Activity.
main2.xml
The AndroidManifest.xml
After coming back to the first activity from second
Activity, hit the backbutton to see if any other activities are below.
If there is an activity then you will be taken to that activity,
otherwise your application will close.
Basically if you open a number of activities, each activity is stacked one above the other like a stack if you are not calling finish() on each activity.
But there is a way to close all these activities at once by clearing the stack.
Here is a simple in which it has two activities and after navigating to the second view, the button click will open the first activity and clear the stack.
CloseAllViews.java – This is the first activity.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
| package pack.coderzheaven;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class CloseAllViewsDemo extends Activity { Button b; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); b = (Button)findViewById(R.id.Button01); b.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(CloseAllViewsDemo.this, Second.class)); } }); }} |
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| <?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" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="This is the First activity." /><Button android:text="Go to Second Activity without closing" android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button></LinearLayout> |
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
| package pack.coderzheaven;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class Second extends Activity { Button b; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2); b = (Button)findViewById(R.id.Button01); b.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Context context = v.getContext(); Intent intent = new Intent(context, CloseAllViewsDemo.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);// This flag ensures all activities on top of the CloseAllViewsDemo are cleared. context.startActivity(intent); } }); }} |
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| <?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" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="This is the second activity. The button click will clear the stack. click the Backbutton to see." /><Button android:text="Go to First Activity without closing" android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button></LinearLayout> |
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| <?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="pack.coderzheaven" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".CloseAllViewsDemo" 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=".Second" android:label="@string/app_name" /> </application></manifest> |
No comments:
Post a Comment