我有一个非常简单的Android活动,创建一个视图和一个计时器。计时器任务通过调用“setTextColor”来更新UI。执行时,我注意到由“java.util.concurrent.CopyOnWriteArrayList”分配的内存,由调用“setTextColor”引起。有没有办法避免这种情况?我的意图是运行这个简单的定时器,它可以监视内存而不会修改所消耗的内存更新Android UI没有泄漏内存
的活动如下:
public class AndroidTestActivity extends Activity
{
Runnable updateUIRunnable; // The Runnable object executed on the UI thread.
long previousHeapFreeSize; // Heap size last time the timer task executed.
TextView text; // Some text do display.
// The timer task that executes the Runnable on the UI thread that updates the UI.
class UpdateTimerTask extends TimerTask
{
@Override
public void run()
{
runOnUiThread(updateUIRunnable);
}
}
@Override
public void onCreate(Bundle savedInstanceState)
{
// Super.
super.onCreate(savedInstanceState);
// Create the Runnable that will run on and update the UI.
updateUIRunnable = new Runnable()
{
@Override
public void run()
{
// Set the text color depending on the change in the free memory.
long heapFreeSize = Runtime.getRuntime().freeMemory();
if (previousHeapFreeSize != heapFreeSize)
{
text.setTextColor(0xFFFF0000);
}
else
{
text.setTextColor(0xFF00FF00);
}
previousHeapFreeSize = heapFreeSize;
}
};
// Create a frame layout to hold a text view.
FrameLayout frameLayout = new FrameLayout(this);
FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
frameLayout.setLayoutParams(layoutParams);
// Create and add the text to the frame layout.
text = new TextView(this);
text.setGravity(Gravity.TOP | Gravity.LEFT);
text.setText("Text");
frameLayout.addView(text);
// Set the content view to the frame layout.
setContentView(frameLayout);
// Start the update timer.
UpdateTimerTask timerTask = new UpdateTimerTask();
Timer timer = new Timer();
timer.scheduleAtFixedRate(timerTask, 500, 500);
}
}
是否有理由不应该只在ddms和MAT中使用分配跟踪器? – jqpubliq 2012-04-10 01:36:20
因为两者都只是被动地通知你泄漏内存。我希望在检测到内存泄漏时更改屏幕上的内容。 – 2012-04-10 02:15:46