Android学习笔记——ProgressBar

该工程的功能是实现进度条的显示，按以下按钮进度条增加10%

 

以下代码是MainActivity.java中的代码

package com.example.progressbar;



import android.app.Activity;



import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ProgressBar;



public class MainActivity extends Activity {

    

    //申明限量

    private ProgressBar firstBar = null;

    private ProgressBar secondBar = null;

    private Button myButton = null;

    private int i = 0;

    

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //根据控件的ID来取得代表控件的对象

        firstBar = (ProgressBar)findViewById(R.id.firstBar);

        secondBar = (ProgressBar)findViewById(R.id.secondBar);

        myButton = (Button)findViewById(R.id.myButton);

        myButton.setOnClickListener(new ButtonListener());

        System.out.print(firstBar.getMax());

    }

    

    class ButtonListener implements OnClickListener{



        @Override

        public void onClick(View v) {

            // TODO Auto-generated method stub

            if(i == 0)

            {    

                //设置进度条处于可见的状态

                firstBar.setVisibility(View.VISIBLE);

                secondBar.setVisibility(View.VISIBLE);

            }

            else if(i < firstBar.getMax())

            {    

                //设置主进度条的当前值

                firstBar.setProgress(i);

                //设置第二进度条的当前值

                firstBar.setSecondaryProgress(i + 10);

                //因为默认的进度条无法显示进行的状态

                //secondBar.setProgress(i);

            }

            else

            {    

                //设置进度条处于不可见状态

                firstBar.setVisibility(View.GONE);

                secondBar.setVisibility(View.GONE);

            }

            i = i + 10;

        }



    }

}

 

以下代码是activity_main.xml中的代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/LinearLayout1"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical"

    tools:context="${relativePackage}.${activityClass}" >



    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    

    <ProgressBar

        android:id="@+id/firstBar"

        style="?android:attr/progressBarStyleHorizontal"

        android:layout_width="200dp"

        android:layout_height="wrap_content"

        android:visibility="gone"

        />

    

    <ProgressBar

        android:id="@+id/secondBar"

        style="?android:attr/progressBarStyle"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:visibility="gone"

        android:max="200"

        />



    <Button

        android:id="@+id/myButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="begin"

        />

    

    

</LinearLayout>