Android中的putExtra()和getBooleanExtra()

问题描述

我正在开发实现mapsView的应用程序.我有两个活动导致了mapsView活动.activity_A将导致mapsView活动，而mapsView活动将导致activity_B.我正在我的代码中实现 putExtra()和 getBooleanExtra().

I'm developing an app that implements mapsView. I have two activities that lead to the mapsView activity. activity_A will lead to mapsView activity, and the mapsView activity will lead to the activity_B. I'm implementing putExtra() and getBooleanExtra() in my code.

这是我在activity_A中的代码

Here's my code in activity_A

case R.id.buttonMaps:
    Intent i = new Intent(MainActivity.this, MapsActivity.class);
    i.putExtra("maps", false);
    startActivity(i);
break;

这是我在activity_B中的代码

Here's my code in activity_B

buttonNavigasi.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent i = new Intent(DetailActivity.this,MapsActivity.class);
        i.putExtra("nama", daftarNama);
        i.putExtra("deskripsi", daftarDeskripsi);
        i.putExtra("foto", daftarFoto);
        i.putExtra("marker", daftarMarker);
        i.putExtra("lat", daftarLat);
        i.putExtra("lng", daftarLng);
        i.putExtra("maps", true);
        startActivity(i);
     }
});

这是我在mapsView活动中的代码

Here's my code in mapsView activity

case R.id.action_refresh:
     removeAllMarkers();
     if(i.getBooleanExtra("maps", true)) {
         mMyMarkersArray.add(new MyMarker(i.getStringExtra("nama"), i.getStringExtra("deskripsi"), i.getStringExtra("foto"), i.getStringExtra("marker"), Double.parseDouble(i.getStringExtra("lat")), Double.parseDouble(i.getStringExtra("lng"))));
         UI_HANDLER.postDelayed(UI_UPDATE_RUNNABLE, 500);
     }
     else {
         registerReceiver(mNetworkReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
     }
     getCurrentLocation();
     return true;

问题是，当mapsView转到activity_B并在activity_B中按下返回按钮(返回mapsView活动)，然后在mapsView中按下刷新图标时，mapsView将转到此代码

The problem is when the mapsView go to activity_B and in activity_B I pressed the back button (back to mapsView activity) then I pressed the refresh icon in mapsView, the mapsView will go to this code

if(i.getBooleanExtra("maps", true)) {
     mMyMarkersArray.add(new MyMarker(i.getStringExtra("nama"), i.getStringExtra("deskripsi"), i.getStringExtra("foto"), i.getStringExtra("marker"), Double.parseDouble(i.getStringExtra("lat")), Double.parseDouble(i.getStringExtra("lng"))));
     UI_HANDLER.postDelayed(UI_UPDATE_RUNNABLE, 500);
}

为什么在mapsView活动中没有转到 else 语句?我不按activity_B中的 buttonNavigasi ，而是按返回按钮.我的代码有什么问题?

Why it doesn't go to the else statement in mapsView activity? I do not press the buttonNavigasi in activity_B, but I just press the back button. What's wrong with my code?

任何答案将不胜感激.

谢谢.

推荐答案

当您按下后退"按钮时，您先前的活动将恢复.

When you press back button your previous activity is just resumed

private boolean registerRecr=false;

@Override
protected void onRestart() {
    // TODO Auto-generated method stub
    super.onRestart();

    registerRecr=true;


}
@Override
protected void onStart() {
    // TODO Auto-generated method stub
    super.onStart();

}

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();

}

 case R.id.action_refresh:
 removeAllMarkers();
 if(i.getBooleanExtra("maps", true)&& registerRecr==false) {
     mMyMarkersArray.add(new MyMarker(i.getStringExtra("nama"), i.getStringExtra("deskripsi"), i.getStringExtra("foto"), i.getStringExtra("marker"), Double.parseDouble(i.getStringExtra("lat")), Double.parseDouble(i.getStringExtra("lng"))));
     UI_HANDLER.postDelayed(UI_UPDATE_RUNNABLE, 500);
 }
 else {
     registerReceiver(mNetworkReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
 }
 getCurrentLocation();
 return true;

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