安卓 AsyncTask 异步任务
Posted Gendan
tags:
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package com.kk.laodi;
import androidx.appcompat.app.AppCompatActivity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class AsyncTask1 extends AppCompatActivity {
private Button btn_dl, right_hand, left_hand, right_foot, left_foot;
private ImageView img01;
private String image_path = "https://img.lianzhixiu.com/uploads/allimg/202104/9999/7490b1acfa.jpg";
private ProgressDialog dialog;
private MyTask myTask; // 异步任务写外面,不要创建实例。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_async_task1);
btn_dl = (Button)this.findViewById(R.id.btn_dl);
right_hand = (Button)this.findViewById(R.id.right_hand);
right_foot = (Button)this.findViewById(R.id.right_foot);
left_hand = (Button)this.findViewById(R.id.left_hand);
left_foot = (Button)this.findViewById(R.id.left_foot) ;
img01 = (ImageView)this.findViewById(R.id.img01);
dialog = new ProgressDialog(this);
dialog.setTitle("提示");
dialog.setMessage("正在下载,[PayPal下载](https://www.gendan5.com/wallet/PayPal.html)请稍后...");
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); // 对话框里面设置进度条。最后显示对话框就可以。
// dialog.setCancelable(false); // 设置不能消失
btn_dl.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(myTask != null && !myTask.isCancelled()) {
return;
}
myTask = new MyTask();
myTask.execute(image_path);
}
});
left_hand.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(myTask !=null && myTask.getStatus() == AsyncTask.Status.RUNNING){
myTask.cancel(true);
}
}
});
}
public class MyTask extends AsyncTask<String, Integer, Bitmap>{
@Override
protected void onPreExecute() {
super.onPreExecute();
// dialog.show();
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
// dialog.setProgress(values[0]);
if(isCancelled()){
return;
}
switch (values[0]) {
case 1:
left_foot.setText("点我");
break;
case 2:
left_hand.setText("点我");
break;
case 3:
right_foot.setText("点我");
break;
case 4:
right_hand.setText("点我");
break;
case 5:
left_foot.setText("左脚");
break;
case 6:
left_hand.setText("左手");
break;
case 7:
right_foot.setText("右脚");
break;
case 8:
right_hand.setText("右手");
break;
}
}
@Override
protected Bitmap doInBackground(String... params) {
/**
* 完成闪按钮功能
*/
int i = 0;
while(i <= 100){
if(isCancelled()){
break;
}
publishProgress(i);
i = i % 8;
delay_ms(2000);
publishProgress(i);
i++;
}
//
return null;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
dialog.dismiss();
img01.setImageBitmap(result);
}
}
public void delay_ms(int t) {
try
{
Thread.currentThread().sleep(t);//毫秒
}
catch(Exception e){
}
}
}
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