公司的需求是这样的,APP切换到前台是向服务器发送数据,切换到后台是也发送数据。网上这方面的方法很多也很杂,还不好用,这里介绍一种完美的解决方法,无论是back键还是home键切换到后台都可以监听,甚至通过后台杀死APP进程都逃不过。
首先写一个工具类:
import android.app.Activity;
import android.app.Application;
import android.os.Bundle;
/**
* Created by Administrator on 2018/3/20.
*/
public class AppFrontBackHelper {
private OnAppStatusListener mOnAppStatusListener;
public AppFrontBackHelper() {
}
/**
* 注册状态监听,仅在Application中使用
*
* @param application
* @param listener
*/
public void register(Application application, OnAppStatusListener listener) {
mOnAppStatusListener = listener;
application.registerActivityLifecycleCallbacks(activityLifecycleCallbacks);
}
public void unRegister(Application application) {
application.unregisterActivityLifecycleCallbacks(activityLifecycleCallbacks);
}
private Application.ActivityLifecycleCallbacks activityLifecycleCallbacks = new Application.ActivityLifecycleCallbacks() {
//打开的Activity数量统计
private int activityStartCount = 0;
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
activityStartCount++;
//数值从0变到1说明是从后台切到前台
if (activityStartCount == 1) {
//从后台切到前台
if (mOnAppStatusListener != null) {
mOnAppStatusListener.onFront();
}
}
}
@Override
public void onActivityResumed(Activity activity) {
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
activityStartCount--;
//数值从1到0说明是从前台切到后台
if (activityStartCount == 0) {
//从前台切到后台
if (mOnAppStatusListener != null) {
mOnAppStatusListener.onBack();
}
}
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
};
public interface OnAppStatusListener {
void onFront();
void onBack();
}
}
- 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
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
然后自定义一个类,继承Application,这个类的名字先别乱起,看看清单文件 application下是否有name标签,如果有就用这个名字命名这个类,如果没有就添加一个name标签,name的值要和这个类的名称一致。
public class MyApp extends Application {
@Override
public void onCreate() {
super.onCreate();
AppFrontBackHelper helper = new AppFrontBackHelper();
helper.register(MyApp.this, new AppFrontBackHelper.OnAppStatusListener() {
@Override
public void onFront() {
//应用切到前台处理
Log.i("info","前台");
}
@Override
public void onBack() {
//应用切到后台处理
Log.i("info","后台");
}
});
}
}
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
这样就OK了。