??使用背景：專案中需要使用幾個機器學習模型，由于加載很緩慢，所以考慮用ProgressDialog來進行提示，預測結束后dialog自動消失，
??效果如下：
1.宣告Handler和ProgressDialog
public ProgressDialog progressDialog;
public Handler handler = null;
2.點擊事件
query.setOnClickListener(v -> {
progressDialog = new ProgressDialog(AdaBoostActivity.this);
progressDialog.setTitle("提示");
progressDialog.setMessage("正在加載...");
progressDialog.setIcon(R.drawable.running);
new Thread(){
public void run(){
try{
runOnUiThread(() -> createList());
Message msg = new Message();
msg.what = 1;
handler.sendMessage(msg);
}catch(Exception e){
e.printStackTrace();
}
}
}.start();//執行緒啟動
handler = new Handler(){
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
progressDialog.dismiss();
ToastUtil.showMessage(AdaBoostActivity.this, "預測完成!");
}
};
progressDialog.show();
});
其中：
runOnUiThread(() -> createList());
??createList()方法完成后ProgressDialog消失，因為createList()中涉及到渲染TextView，所以使用runOnUiThread()，
??createList完成后handler發送訊息：
Message msg = new Message();
msg.what = 1;
handler.sendMessage(msg);
??然后銷毀dialog：
handler = new Handler(){
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
progressDialog.dismiss();
ToastUtil.showMessage(AdaBoostActivity.this, "預測完成!");
}
};
3.銷毀執行緒
@Override
protected void onDestroy() {
super.onDestroy();
if(handler != null) {
handler.removeCallbacksAndMessages(null);
}
}
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標籤：其他