一种动态水平ProgressBar的实现

ProgressBar为进度条，通过它可以显示任务完成的进度，下面是动态水平ProgressBar的一种实现方式：

布局文件horizontal_progress_layout.xml如下：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <ProgressBar         android:id="@+id/progressbar"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:layout_centerVertical="true"        android:text="水平进度条"        style="?android:attr/progressBarStyleHorizontal"        android:max="100"        android:progress="50"        android:secondaryProgress="70"        />RelativeLayout>

逻辑实现类MainActivity.java如下：

package com.example.huawei;import android.os.Bundle;import android.R.integer;import android.animation.ObjectAnimator;import android.app.Activity;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.view.animation.TranslateAnimation;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.ProgressBar;import android.widget.TextView;public class MainActivity extends Activity {    private Thread thread;    private ProgressBar progressBar;    private boolean stateChange = true;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.horizontal_progress_layout);        progressBar = (ProgressBar)findViewById(R.id.progressbar);        thread = new Thread(new Runnable() {            @Override            public void run() {                // TODO Auto-generated method stub                while(true){                    int currentValue = progressBar.getProgress();                    int currentMaxValue = progressBar.getMax();                    int currentSecondaryValue = progressBar.getSecondaryProgress();                    if(stateChange == false){                        if(currentValue >= currentMaxValue){                            stateChange = true;                        }else{                            progressBar.setProgress(currentValue + 1);                            progressBar.setSecondaryProgress(currentValue+1);                        }                    }else{                        if(currentValue <= 0){                            stateChange = false;                        }else{                            progressBar.setProgress(currentValue - 1);                        }                    }                    try{                        Thread.sleep(50);                    }catch(InterruptedException e){                        e.printStackTrace();                    }                }            }        });        thread.start();    }    @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;    }}

实际效果图如下：

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