Android學習筆記——ProgressBar

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該工程的功能是實現進度條的顯示，按以下按鈕進度條增加10%

 

以下代碼是MainActivity.java中的代碼

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);        //根據控制項的ID來取得代表控制項的對象        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)            {                    //設定進度條處於可見的狀態                firstBar.setVisibility(View.VISIBLE);                secondBar.setVisibility(View.VISIBLE);            }            else if(i < firstBar.getMax())            {                    //設定主進度條的當前值                firstBar.setProgress(i);                //設定第二進度條的當前值                firstBar.setSecondaryProgress(i + 10);                //因為預設的進度條無法顯示進行的狀態                //secondBar.setProgress(i);            }            else            {                    //設定進度條處於不可見狀態                firstBar.setVisibility(View.GONE);                secondBar.setVisibility(View.GONE);            }            i = i + 10;        }    }}

 

以下代碼是activity_main.xml中的代碼

<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>

 

Android學習筆記——ProgressBar