问题描述

使用安卓progressBar进度条实现秒表计时

如题，点击即使按钮后线程启动，但是界面上的TextView与PorgressBar并不显示
package com.example.progressbartime;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

private Button start,stop;
private ProgressBar hbar,mbar,sbar,csbar;
private TextView htv,mtv,stv,cstv;
private Thread mThread;
private Handler mHandler;
private int hour=0,minute=0,second=0,cssecond=0;
private int STOP=0;
private final static int MSG=1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    hbar=(ProgressBar) findViewById(R.id.hourBar);
    sbar=(ProgressBar) findViewById(R.id.secondBar);
    mbar=(ProgressBar) findViewById(R.id.minuteBar);
    csbar=(ProgressBar) findViewById(R.id.CSecondBar);
    htv=(TextView) findViewById(R.id.hourText);
    mtv=(TextView) findViewById(R.id.minuteTV);
    stv=(TextView) findViewById(R.id.secondTV);
    cstv=(TextView) findViewById(R.id.CSecondTV);
    start=(Button) findViewById(R.id.startBtn);
    stop=(Button) findViewById(R.id.stopBtn);
    start.setOnClickListener(new startBtnClick());
    stop.setOnClickListener(new stopBtnClick());
    //设置进度条的最大值以及当前进度
    hbar.setMax(1000);
    //hbar.setProgress(0);
    mbar.setMax(60);
    //mbar.setProgress(0);
    sbar.setMax(60);
    //sbar.setProgress(0);
    csbar.setMax(100);
    //csbar.setProgress(0);
    mThread=new mThread();
    mHandler=new mHandler();

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment())
                .commit();
    }
}

public class startBtnClick implements OnClickListener {

    @Override
    public void onClick(View arg0) {
        STOP=1;
        mThread.start();

    }

}

public class stopBtnClick implements OnClickListener {

    @Override
    public void onClick(View arg0) {
        STOP=0;

    }

}

public class mHandler extends Handler {

    @Override
    public void handleMessage(Message msg) {
        switch(msg.what){
        case MSG:{
            int csecond=((Integer) msg.obj)%101;
            if(csecond==100){
                second++;
                csecond=0;
            }
            if(second==60){
                minute++;
                second=0;
            }
            if(minute==60){
                hour++;
                minute=0;
            }
            hbar.setProgress(hour);
            mbar.setProgress(minute);
            sbar.setProgress(second);
            csbar.setProgress(csecond);
            String h=Integer.toString(hour)+"h";
            String m=Integer.toString(minute)+"m";
            String s=Integer.toString(second)+"s";
            String mm=Integer.toString(csecond)+"mm";
            htv.setText(h);
            mtv.setText(m);
            stv.setText(s);
            cstv.setText(mm);
            break;
        }
        }
    }

}

public class mThread extends Thread {

    @Override
    public void run() {
        while(STOP==1){
        try {
            Thread.sleep(10);
            cssecond++;
            Message message=new Message();
            mHandler.obtainMessage(MSG,cssecond).sendToTarget();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        return rootView;
    }
}

}

解决方案

hbar=(ProgressBar) findViewById(R.id.hourBar);
看看进度条找到没有

解决方案二：

hbar=(ProgressBar) findViewById(R.id.hourBar);
看看进度条找到没有