1
我有一个线程将做一些处理,然后有可运行的代码,它将在屏幕上显示结果。问题是,如果用户在可运行列表介于两行显示代码之间时按下后退箭头,则当该活动不再存在时,下一行将崩溃。在活动切换的情况下停止(线性)可运行的“好”方式是什么?
下面的代码实现了目标,但我讨厌在每行之前有if
语句。有没有更好的办法?
@Override
public void onBackPressed() {
super.onBackPressed();
imgThread.interrupt();
}
private void processImage(){
final Handler mHandler = new Handler(Looper.getMainLooper());
progress = new ProgressDialog(this);
progress.setMessage("TEXT");
progress.setIndeterminate(true);
progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progress.show();
imgThread = new Thread(){
@Override
public void run() {
//Process the image a bit
mHandler.post(new Runnable() {
@Override
public void run() {
if(!imgThread.isInterrupted())
imageView.setImageBitmap(mDisplayBitmap);
if(!imgThread.isInterrupted())
progress.setMessage("TEXT TEXT");
if(!imgThread.isInterrupted())
progress.show();
}
});
//More processing
mHandler.post(new Runnable() {
@Override
public void run() {
if(!imgThread.isInterrupted())
addScreenListener();
if(!imgThread.isInterrupted())
determineHelpToast("TEXT TEXT TEXT", Toast.LENGTH_LONG);
if(!imgThread.isInterrupted())
progress.dismiss();
}
});
}
}; imgThread.start();
}