假如说有一个activity A,在A中跳转到Activity B, 然后在B中跳转到Activity C中,最后要在C中把activity A,B,C都关掉。
当然网上说的有很多方法,其中有些方法是不安全的,我只说一种,不会对其他的代码造成影响就ok了。
首先有一个Activity A,A中有一个Button,点击这个Button会跳到Activity B中去,但会拿到一个返回值,如果返回的是RESULT_OK的话就把Activity A也关掉。
如下:
1 package com.android.intent;
2
3 import android.app.Activity;
4 import android.content.Intent;
5 import android.graphics.Color;
6 import android.os.Bundle;
7 import android.view.View;
8 import android.view.View.OnClickListener;
9 import android.widget.Button;
10
11 public class A extends Activity {
12
13 private View a;
14 private Button button;
15
16 @Override
17 public void onCreate(Bundle savedInstanceState) {
18 super.onCreate(savedInstanceState);
19 setContentView(R.layout.a);
20 a = findViewById(R.id.a);
21 a.setBackgroundColor(Color.RED);
22
23 button = (Button) findViewById(R.id.aButton);
24 button.setOnClickListener(btonClickListener);
25 }
26
27 private OnClickListener btonClickListener = new OnClickListener() {
28
29 @Override
30 public void onClick(View view) {
31 // TODO Auto-generated method stub
32 Intent intent = new Intent();
33 intent.setClass(A.this, B.class);
34 startActivityForResult(intent, 0);
35 }
36 };
37
38 @Override
39 protected void onPause() {
40 // TODO Auto-generated method stub
41 super.onPause();
42 System.out.println("activity A onPause");
43 }
44
45 @Override
46 protected void onDestroy() {
47 // TODO Auto-generated method stub
48 super.onDestroy();
49 System.out.println("activity A onDestory");
50 }
51
52 @Override
53 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
54 // TODO Auto-generated method stub
55 if(requestCode == 0 && resultCode == RESULT_OK) {
56 finish();
57 }
58 }
59 }
A的布局文件,a.xml:
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="fill_parent"
5 android:layout_height="fill_parent"
6 android:id="@+id/a">
7 <TextView
8 android:layout_width="fill_parent"
9 android:layout_height="wrap_content"
10 android:text="I am activity A!"
11 android:textSize="36sp"
12 android:gravity="center"/>
13 <Button
14 android:layout_width="match_parent"
15 android:layout_height="wrap_content"
16 android:id="@+id/aButton"
17 android:text="intent to activity B"/>
18 </LinearLayout>
同样有Activity B,和B的布局文件b.xml:
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="fill_parent"
5 android:layout_height="fill_parent"
6 android:id="@+id/b">
7 <TextView
8 android:layout_width="fill_parent"
9 android:layout_height="wrap_content"
10 android:text="I am activity B"
11 android:textSize="36sp"
12 android:gravity="center"/>
13 <Button
14 android:layout_width="match_parent"
15 android:layout_height="wrap_content"
16 android:id="@+id/bButton"
17 android:text="intent to activity C"/>
18 </LinearLayout>
package com.android.intent;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class B extends Activity {
private View b;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.b);
b = findViewById(R.id.b);
b.setBackgroundColor(Color.GREEN);
button = (Button) findViewById(R.id.bButton);
button.setOnClickListener(bButtonOnClickListener);
}
private OnClickListener bButtonOnClickListener = new OnClickListener() {
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setClass(B.this, C.class);
startActivityForResult(intent, 0);
}
};
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
System.out.println("activity B onPause");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
System.out.println("activity B onDestory");
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if(requestCode == 0 && resultCode == RESULT_OK) {
setResult(RESULT_OK);
finish();
}
}
}
还有Activity C 和它的布局文件c.xml,但它不做任何跳转,只想Activity B返回一个值,如何设置了这个返回值的话:
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="fill_parent"
5 android:layout_height="fill_parent"
6 android:id="@+id/c">
7 <TextView
8 android:layout_width="fill_parent"
9 android:layout_height="wrap_content"
10 android:text="I am acitivity C"
11 android:textSize="36sp"
12 android:gravity="center"/>
13 <Button
14 android:layout_width="match_parent"
15 android:layout_height="wrap_content"
16 android:id="@+id/cButton1"
17 android:text="closeAll">
18 </Button>
19
20 <Button
21 android:layout_width="match_parent"
22 android:layout_height="wrap_content"
23 android:id="@+id/cButton2"
24 android:text="close myself"/>
25 </LinearLayout>
1 package com.android.intent;
2
3 import android.app.Activity;
4 import android.graphics.Color;
5 import android.os.Bundle;
6 import android.view.View;
7 import android.view.View.OnClickListener;
8 import android.widget.Button;
9
10 public class C extends Activity {
11
12 private View c;
13 private Button button1;
14 private Button button2;
15
16 @Override
17 protected void onCreate(Bundle savedInstanceState) {
18 // TODO Auto-generated method stub
19 super.onCreate(savedInstanceState);
20 setContentView(R.layout.c);
21 c = findViewById(R.id.c);
22 c.setBackgroundColor(Color.YELLOW);
23
24 button1 = (Button) findViewById(R.id.cButton1);
25 button1.setOnClickListener(cOnClickListener);
26
27 button2 = (Button) findViewById(R.id.cButton2);
28 button2.setOnClickListener(cOnClickListener);
29 }
30
31 @Override
32 protected void onPause() {
33 // TODO Auto-generated method stub
34 super.onPause();
35 System.out.println("activity C onPause");
36 }
37
38 @Override
39 protected void onDestroy() {
40 // TODO Auto-generated method stub
41 super.onDestroy();
42 System.out.println("activity C onDestory");
43 }
44
45 private OnClickListener cOnClickListener = new OnClickListener() {
46
47 @Override
48 public void onClick(View view) {
49 // TODO Auto-generated method stub
50 switch(view.getId()) {
51 case R.id.cButton1:
52 setResult(RESULT_OK);
53 finish();
54 break;
55
56 case R.id.cButton2:
57 finish();
58 break;
59
60 default:
61 break;
62 }
63 }
64 };
65 }
Activity C中有2个Button,一个是关闭自己,另一个是关闭所有的Activity。
关闭自己很简单,直接finish()就ok了。
关闭所有的就需要先设置一个返回值,然后关闭自己(注意一点要先设置返回值),这是先走Activity C的onPause(),然后走Activity C的onDestory(),完了之后就会将返回值传给Activity B。
在Activity B的OnActivityResult(int requestCode, int resultCode, Intent data)中就会对传回来的参数进行判断,如果是RESULT_OK 就先设置Activity A的返回值,然后finish()自己就ok了,这是先走Activity B的onPause(),然后走Activity B的onDestory(),完了之后就会将返回值传给Activity A。
在Activity A的OnActivityResult(int requestCode, int resultCode, Intent data)中就会对传回来的参数进行判断,如果是RESULT_OK finish()自己就ok了,这是先走Activity A的onPause(),然后走ActivityA 的onDestory(),完了之后就会将返回值传给Activity A。
点击Activity C上的关闭自己出现的log:
02-22 06:04:22.107: INFO/System.out(8159): activity A onPause
02-22 06:04:23.839: INFO/System.out(8159): activity B onPause
02-22 06:04:25.598: INFO/System.out(8159): activity C onPause
02-22 06:04:25.879: INFO/System.out(8159): activity C onDestory
然后点击Activity B上的Button,然后在点击Activity C上的关闭所有出现的log:
02-22 06:04:22.107: INFO/System.out(8159): activity A onPause
02-22 06:04:23.839: INFO/System.out(8159): activity B onPause
02-22 06:04:25.598: INFO/System.out(8159): activity C onPause
02-22 06:04:25.879: INFO/System.out(8159): activity C onDestory
02-22 06:06:04.848: INFO/System.out(8159): activity B onPause
02-22 06:06:06.349: INFO/System.out(8159): activity C onPause
02-22 06:06:06.879: INFO/System.out(8159): activity C onDestory
02-22 06:06:06.889: INFO/System.out(8159): activity B onDestory
02-22 06:06:06.908: INFO/System.out(8159): activity A onDestory
这只是自己学习中的笔记,留待以后参考。
代码: