[英]How to launch the same activity even app is in background?
我的應用程序中有3個活動,分別是A和B。登錄活動是我的啟動器頁面。 登錄后,它將重定向到活動A。現在立即單擊主頁按鈕,它將暫停活動A並轉到后台,同時單擊應用程序圖標,它將重新啟動活動A。即使活動A在背景。 我該如何做到這一點,請幫忙?
每當您的應用進入后台時,您都需要完成所有活動
HomeWatcher.java
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
public class HomeWatcher {
static final String TAG = HomeWatcher.class.getSimpleName();
private Context mContext;
private IntentFilter mFilter;
private OnHomePressedListener mListener;
private InnerRecevier mRecevier;
public HomeWatcher(Context context) {
mContext = context;
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
}
public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
mRecevier = new InnerRecevier();
}
public void startWatch() {
if (mRecevier != null) {
mContext.registerReceiver(mRecevier, mFilter);
}
}
public void stopWatch() {
if (mRecevier != null) {
mContext.unregisterReceiver(mRecevier);
}
}
class InnerRecevier extends BroadcastReceiver {
final String SYSTEM_DIALOG_REASON_KEY = "reason";
final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";
final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
if (reason != null) {
if (mListener != null) {
if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
mListener.onHomePressed();
} else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
mListener.onRecentAppPressed();
}
}
}
}
}
}
}
MyApplication.java
public class MyApplication extends Application implements Application.ActivityLifecycleCallbacks {
private static MyApplication mInstance;
public static String TAG = MyApplication.class.getSimpleName();
private Activity mActivity;
@Override
public void onCreate() {
super.onCreate();
mInstance = this;
registerActivityLifecycleCallbacks(this);
HomeWatcher mHomeWatcher = new HomeWatcher(this);
mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
@Override
public void onHomePressed() {
// do other stuff before finish
Log.d(TAG, "onHomePressed");
if (mActivity != null)
mActivity.finishAffinity();
}
@Override
public void onRecentAppPressed() {
// do other stuff before finish
Log.d(TAG, "onRecentAppPressed ");
if (mActivity != null)
mActivity.finishAffinity();
}
});
mHomeWatcher.startWatch();
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
mActivity = activity;
}
@Override
public void onActivityStarted(Activity activity) {
mActivity = activity;
}
@Override
public void onActivityResumed(Activity activity) {
mActivity = activity;
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
}
AndroidManifest.xml
<application
android:name="your_package_name.MyApplication">
....
</application>
如果只想在“ A”活動來自后台時啟動登錄活動,則可以使用“ onResume”方法。 您可以正常意圖啟動登錄活動,並且在同一登錄活動中,您應該檢查用戶是否已登錄或不采取相應措施
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