我有一个非常简单的 Android Activity，它创建了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，这是由对“setTextColor”的调用引起的。有没有办法避免这种情况？我的目的是运行这个简单的计时器来监控内存而不修改消耗的内存。
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);
}
}