Android实例，更新进度条，进度条应用。

男娘i 2023-07-04 08:44 14阅读 0赞

效果如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc4Njc1Ng_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc4Njc1Ng_size_16_color_FFFFFF_t_70 1]

**activity\_main.xml文件**

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@mipmap/bj4"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.mingrisoft.startgame.MainActivity">
    
        <ProgressBar
            android:id="@+id/pg"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            style="@android:style/Widget.ProgressBar.Horizontal"
            android:max="100"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="50dp"/>
    
    </RelativeLayout>

**MainActivity.java文件**

package com.mingrisoft.startgame;
    
    import android.os.Message;
    import android.support.v7.app.ActionBarActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.view.WindowManager;
    import android.widget.ProgressBar;
    
    import android.os.Handler;
    import android.widget.Toast;
    
    import java.util.logging.LogRecord;
    
    public class MainActivity extends ActionBarActivity { 
        private ProgressBar progressBar;
        //当前进度
        private int mProgress=0;
        //消息处理
        private Handler mHandler;
        @Override
        protected void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            //全屏显示
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
            progressBar= (ProgressBar) findViewById(R.id.pg);
            //消息处理机制
            mHandler=new Handler() { 
                @Override
                public void handleMessage(Message msg) { 
                    if(msg.what==0x111){ 
                        //更新进度条
                        progressBar.setProgress(mProgress);
                    }
                    else
                    { 
                        //显示更新完成，进度条不再显示。
                        Toast.makeText(MainActivity.this, "耗时操作已完成", Toast.LENGTH_SHORT).show();
                        progressBar.setVisibility(View.GONE);
                    }
                }
            };
            //创建一个线程，模拟耗时操作，并发出消息
            new Thread(new Runnable() { 
                @Override
                public void run() { 
                    while(true)
                    { 
                        mProgress=doWork();
                        Message m=new Message();
                        if(mProgress<100){ 
                            m.what=0x111;//耗时操作未完成，为自定义代码，一般以0x开头
                            mHandler.sendMessage(m);
                        }
                        else
                        { 
                            m.what=0x110;//耗时操作已完成
                            mHandler.sendMessage(m);
                            break;
                        }
                    }
                }
                private  int doWork()
                { 
                    mProgress+=Math.random()*10;
                    try { 
                        Thread.sleep(200);
                    } catch (InterruptedException e) { 
                        e.printStackTrace();
                    }
                    return mProgress;
                }
            }).start();//开始线程
        }
    }

**完成啦！**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc4Njc1Ng_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200209171743907.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc4Njc1Ng==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc4Njc1Ng_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200209171809266.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc4Njc1Ng==,size_16,color_FFFFFF,t_70