Android（進度條）異步更新UI的三種方式

轉載請備註出自於：http://blog.csdn.net/qq_22118507/article/details/51489276

1.使用Handler的post(Runnabel r)方法

package com.bar;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends Activity implements OnClickListener {
    @Bind(R.id.bar)
    ProgressBar bar;
    @Bind(R.id.startBtn)
    Button startBtn;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

    }


    //使用匿名內部類
    Handler updateBarHandler = new Handler() {
        public void handleMessage(Message msg) {
            bar.setProgress(msg.arg1);
            updateBarHandler.post(updateThread);
        }
    };
    //使用匿名內部類聲明線程類
    Runnable updateThread = new Runnable() {
        int i = 0;

        public void run() {
            i += 10;
            //得到一個消息對象
            Message msg = updateBarHandler.obtainMessage();
            //將msg對象的arg1參數的值設置爲i;
            msg.arg1 = i;
            try {
                //設置當前線程休眠1秒
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            //將msg對象加入到消息隊列當中（尾部）
            updateBarHandler.sendMessage(msg);

            if (i == 100) {
                //如果當i的值爲100時將當前線程從handler中移除
                updateBarHandler.removeCallbacks(updateThread);
            }
        }
    };

    @OnClick({R.id.bar, R.id.startBtn})
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.bar:
                break;
            case R.id.startBtn:
                //設置進度條顯示方式爲可見
                bar.setVisibility(View.VISIBLE);
                //將線程添加到Handler消息隊列
                updateBarHandler.post(updateThread);
                break;
        }
    }

}

2.使用Handler+thread消息傳遞機制

public class MainActivity extends Activity implements OnClickListener {
    @Bind(R.id.bar)
    ProgressBar bar;
    @Bind(R.id.startBtn)
    Button startBtn;
    MyThread myThread;
   
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        myThread = new MyThread();

    }

    //使用匿名內部類
    Handler updateBarHandler = new Handler() {
        public void handleMessage(Message msg) {
            bar.setProgress(msg.arg1);
           
        }
    };

    public class MyThread extends Thread {
       
        public void run() {
            for (int i = 0; i < 101; i += 10) {
                // i += 10;
                //得到一個消息對象
                Message msg = updateBarHandler.obtainMessage();
                //將msg對象的arg1參數的值設置爲i;
                msg.arg1 = i;
                try {
                    //設置當前線程休眠1秒
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                //將msg對象加入到消息隊列當中（尾部）
                updateBarHandler.sendMessage(msg);

            }
        }
    }

   
    @OnClick({R.id.bar, R.id.startBtn})
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.bar:
                break;
            case R.id.startBtn:
                //設置進度條顯示方式爲可見
                bar.setVisibility(View.VISIBLE);
                 //線程啓動
                myThread.start();

                break;
        }
    }

}

3.使用AsyncTask異步任務更新UI

public class MainActivity extends Activity implements OnClickListener {

    @Bind(R.id.bar)
    ProgressBar bar;
    @Bind(R.id.startBtn)
    Button startBtn;
    

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

    }

     class MyAsyncTask extends AsyncTask<Void, Integer, Void> {
         

         @Override
        protected Void doInBackground(Void... params) {
            for (int i = 0; i <= 100; i += 10) {

                publishProgress(i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    }

	@Override
         protected void onProgressUpdate(Integer... values) {
             super.onProgressUpdate(values);
             bar.setVisibility(View.VISIBLE);
             bar.setProgress(values[0]);
         }

@OnClick({R.id.bar, R.id.startBtn}) public void onClick(View view) { switch (view.getId()) { case R.id.bar: break; case R.id.startBtn: MyAsyncTask myAsyncTask = new MyAsyncTask(); myAsyncTask.execute(); break; } }}