How to fix Android memory problems

Android project due to the loading of more pictures, so often reported memory overflow errors, when the project contains a large number of pictures, or pictures too large, may be oom, common Hu solution is as follows:

Method 1: Zoom out of the picture

                Bitmapfactory.options Options = new Bitmapfactory.options ();                Options.insamplesize = 4;

Method 2: Take a soft reference to the picture and do the Recyle () operation in a timely manner

              Softreference<bitmap> Bitmap;              Bitmap = new softreference<bitmap> (pbitmap);         if (bitmap! = null) {              <span style= "White-space:pre" ></span>   if (bitmap.get ()! = NULL &&! Bitmap.get (). isRecycled ()) {                   bitmap.get (). Recycle ();                   bitmap = null;             }             }

Method 3: Design and encode the complex listview properly:

1. Note the use of Convertview and holder mechanisms in the reuse of adapter

Public View GetView (int position, View Convertview, ViewGroup parent) {  if (Convertview = = null) {            v = minflater.i Nflate (Resource, parent, false);            Final int[] to = MTo;            Final int count = to.length;            Final view[] holder = new View[count];            for (int i = 0; i < count; i++) {                Holder[i] = V.findviewbyid (To[i]);            }    V.settag (holder);        } else {        }    }

2. The above method attempt has not been successful and can be used with the lazy loading data

Method 4: Single page, toggle N-Time after OOM on screen

1. See if there are any large pictures in the page layout, such as the background map. Remove the relevant settings from the XML and set the background map in the program (in the OnCreate () method):

<span style= "White-space:pre" ></span>drawable bg = getresources (). getdrawable (R.drawable.bg);        Xxx.setbackgrounddrawable (RLADDETAILONE_BG);

Note When Activity destory, bg.setcallback (null); Prevent the activity from being released in a timely manner 

2. Similar to the above method, directly load the XML configuration file into a View and put it into a container, and then call This.setcontentview (view view) directly;

Avoid repeated loading of XML

Method 5: Reuse as few code as possible during page switching, such as repeating the database call, reusing certain objects, etc...

Method 6:android Heap Memory can also define its own size and optimize heap memory allocations for Dalvik virtual machines

Note If you use this method: project build target can only select the <= 2.2 version, otherwise the compilation will not pass. So it's not recommended in this way

     Private final static int cwj_heap_size= 6*1024*1024; <span style= "White-space:pre" ></span>private final static float target_heap_utilization = 0.75f;        Vmruntime.getruntime (). Setminimumheapsize (cwj_heap_size);        Vmruntime.getruntime (). Settargetheaputilization (target_heap_utilization);

How to fix Android memory problems