android - 在 android 中加载谷歌地图的问题

Question

我正在进行一项主要 Activity ，其中我有一个按钮，当按下此按钮时它会显示 map 。这非常有效。

但是当我按下后退键时，我再次进入我的主要 Activity ，现在当我再次按下 map 按钮时，它会显示整个世界地图。

我的意思是说它从头开始。

我怎样才能从 Back Stack 中完全删除我的 map Activity 并重新创建以根据需要再次显示 map ？

或者任何其他解决方案来做到这一点？

编辑:1

btn_find_atm.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            Intent intent = new Intent(NearByATM.this, Map.class);
            startActivityForResult(intent, request_map);

        }
    });

编辑:2

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (isGooglePlayAvailable()) {

        expld = new ExpandablePlaceListData();

        criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);

        // Getting the service from context and giving to location_manager
        location_manager = (LocationManager) getSystemService(LOCATION_SERVICE);

        setContentView(R.layout.mapdemo);

        placesTask = new PlacesTask();

        getGoogleMap();

        getUserLocation();

        google_map.clear();

        Toast.makeText(this, "Latitude:" + lat + " Longitude:" + lang,
                Toast.LENGTH_LONG).show();

        drawMarker();

        sb = createUrl();

        placesTask.execute(sb);

    }

}

@Override
public void onBackPressed() {
    super.onBackPressed();
    Intent returnIntent = new Intent();
    setResult(RESULT_OK, returnIntent);
    this.finish();
}

编辑:3

private void getUserLocation() {

    if (location_manager != null) {
        provider = location_manager.getBestProvider(criteria, true);
        location = location_manager.getLastKnownLocation(provider);
        location_manager.requestLocationUpdates(provider,
                Map.MIN_TIME_BW_UPDATES,
                Map.MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
        if (location != null) {
            lat = location.getLatitude();
            lang = location.getLongitude();

        } else {

            Toast.makeText(Map.this, "Unable to idntify location",
                    Toast.LENGTH_LONG).show();

            lat = -22.00000;
            lang = 33.0000;

        }
    }
}

编辑:4

当我再次按下按钮加载 map 时，LogCat 会显示类似这些内容。

10-19 16:47:06.048: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:06.086: I/SurfaceTexture(4887): [unnamed-4887-1](this:0x5fa6d608,api:0) detachFromContext
10-19 16:47:06.087: I/BufferQueue(4887): [unnamed-4887-1](this:0x610cd580,api:0) consumerDisconnect
10-19 16:47:06.088: I/BufferQueue(4887): [unnamed-4887-1](this:0x610cd580,api:0) ~BufferQueue
10-19 16:47:06.090: D/dalvikvm(4887): threadid=22: exiting
10-19 16:47:06.096: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:06.097: D/dalvikvm(4887): threadid=22: bye!
10-19 16:47:08.782: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.783: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.785: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.853: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.853: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.854: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.864: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.864: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.865: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.866: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.866: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.867: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.874: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0
10-19 16:47:08.882: W/Trace(4887): Unexpected value from nativeGetEnabledTags: 0

Answer 1

最后我所做的是，

@Override
public void onBackPressed() {
    super.onBackPressed();
    google_map.clear();
    location_manager.removeUpdates(this);
}

在 Activity 结果上，我从后台堆栈中删除了所有 Activity 。

Intent intent = new Intent(NearByATM.this, NearByATM.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);

我也从历史记录中删除了主要 Activity 中的 list 文件，

android:excludeFromRecents="true"
                android:noHistory="true"