1
我有一個線程將做一些處理,然後有可運行的代碼,它將在屏幕上顯示結果。問題是,如果用戶在可運行列表介於兩行顯示代碼之間時按下後退箭頭,則當該活動不再存在時,下一行將崩潰。在活動切換的情況下停止(線性)可運行的「好」方式是什麼?
下面的代碼實現了目標,但我討厭在每行之前有if
語句。有沒有更好的辦法?
@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();
}