学步园

实现该功能的模块组成：

1.在res/layout 中对应xml布局中声明，eg：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <ProgressBar
     style="@android:style/Widget.ProgressBar.Horizontal" 
     android:id="@+id/myProgressBar"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"/>
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
</LinearLayout>

2.java代码：

    2.1.设置布局

           setContentView(R.layout.main);

    2.2.进度条实例化

          import android.widget.ProgressBar;

          private ProgressBar mProgress;

          mProgress = (ProgressBar) findViewById(R.id.myProgressBar);

    2.3.创建新进程，实现自己想要做的事情，并实现进度条动态变化，eg(比如我现在要做的事情是将我的变量mProgressStatus从依次加一，一直到一百，用进度条显示进度)

          import android.os.Handler;

          private int mProgressStatus = 0;

          private Handler mHandler = new Handler();

          new Thread(new Runnable() {
            public void run() {
                while (mProgressStatus < 100) {
                    mProgressStatus++;
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    // Update the progress bar
                    mHandler.post(new Runnable() {
                        public void run() {
                            mProgress.setProgress(mProgressStatus);
                        }
                    });
                }
            }
        }).start();