比如：我点击取消，停止线程里的打印任务
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
volatile boolean isStop=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ProgressDialog dialog = new ProgressDialog(this);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);// 设置进度条的形式为圆形转动的进度条
dialog.setCancelable(true);// 设置是否可以通过点击Back键取消
dialog.setCanceledOnTouchOutside(false);// 设置在点击Dialog外是否取消Dialog进度条
// dialog.setIcon(R.drawable.ic_launcher);//
// 设置提示的title的图标，默认是没有的，如果没有设置title的话只设置Icon是不会显示图标的
dialog.setTitle("提示");
// dismiss监听
dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
// TODO Auto-generated method stub
}
});
// 监听Key事件被传递给dialog
dialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode,
KeyEvent event) {
// TODO Auto-generated method stub
return false;
}
});
// 监听cancel事件
dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
}
});
//设置可点击的按钮，最多有三个(默认情况下)
dialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
dialog.setButton(DialogInterface.BUTTON_NEGATIVE, "取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
System.out.println("取消 dialog = " + dialog);
isStop=true;
}
});
dialog.setButton(DialogInterface.BUTTON_NEUTRAL, "中立",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
dialog.setMessage("这是一个圆形进度条");
dialog.show();
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
for (int i = 0; i < 20; i++) {
if(!isStop) {
Thread.sleep(500);
System.out.println("i = " + i);
}
}
// cancel和dismiss方法本质都是一样的，都是从屏幕中删除Dialog,唯一的区别是
// 调用cancel方法会回调DialogInterface.OnCancelListener如果注册的话,dismiss方法不会回掉
// dialog.cancel();
// dialog.dismiss();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
}
