我有一个TextView
wholayout_width
设置为wrap_content
. 我使用九个补丁图像作为背景。TextView 的内容会定期刷新(我使用休眠一段时间然后启动处理程序的线程)。经过几次迭代后,出现了一些伪影。我可以看到一些较早消息的部分文本和背景(它的宽度大于当前显示的消息的宽度)。可能是什么问题呢?
public void onCreate{
...
helpField = (TextView) findViewById(R.id.helpField);
...
}
private class PeriodicHelp extends Thread{
private static final int SLEEP_TIME = 4000;
private static final int NUM_HELP_PHRASES = 5;
private String getHelp(){
int pos = randomGenerator.nextInt(NUM_HELP_PHRASES);
return helpPhrases[pos];
}
public void run(){
int i = 0;
while(true){
try {
Thread.sleep(SLEEP_TIME);
Log.d(TAG, "periodicHelp " + Integer.toString(i));
i++; //used just for debugging
mHandler.post(new Runnable(){
public void run() {
String help = getHelp();
helpField.setText(help);
}
});
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
}
我开始我的 PeriodicHelp 线程onStart()