模拟ProgressBar下载进度显示

package com.example.administrator.myapplication;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ProgressBar;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    private ProgressBar progress;    private Button start;    private TextView number;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    Handler handler = new Handler(){        @Override        public void handleMessage(final Message msg) {            super.handleMessage(msg);            progress.setProgress(msg.arg1);            number.setText(msg.arg1+"%");            handler.postDelayed(updateProgress,100);        }};    private void initView() {        number = findViewById(R.id.number);        start = findViewById(R.id.start);        progress = findViewById(R.id.progress);        start.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                handler.post(updateProgress);            }        });    }    Runnable updateProgress = new Runnable() {        int i = 0;        @Override        public void run() {            i+=1;            Message message = handler.obtainMessage();            message.arg1 = i;            if(i<=100){                handler.sendMessage(message);            }            if(i==100){                handler.removeCallbacks(updateProgress);            }        }    };}

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