Android入门之进度条(ProgressBar)

 

package com.jkxqj.helloandroid;



import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ProgressBar;



public class MainActivity extends Activity {



	private ProgressBar progressBar;

	private Button firstButton;

	private Button secondButton;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);		

		progressBar = (ProgressBar)findViewById(R.id.firstProgressBar);

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

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

		progressBar.setMax(100);		

		firstButton.setOnClickListener(new FirstListener());

		secondButton.setOnClickListener(new SecondListener());	

	}	

	class FirstListener implements OnClickListener{



		@Override

		public void onClick(View v) {

			progressBar.incrementProgressBy(10);

		}		

	}	

	class SecondListener implements OnClickListener{

		@Override

		public void onClick(View v) {

			progressBar.incrementSecondaryProgressBy(20);

		}

	}

	@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;

	}



}

 

<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: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=".MainActivity" >



    <Button

        android:id="@+id/secondButton"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/firstProgressBar"

        android:layout_below="@+id/firstButton"

        android:layout_marginTop="26dp"

        android:text="增加第二进度" />



    <Button

        android:id="@+id/firstButton"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/secondButton"

        android:layout_below="@+id/firstProgressBar"

        android:layout_marginTop="17dp"

        android:text="增加第一进度" />



    <ProgressBar

        android:id="@+id/firstProgressBar"

        style="?android:attr/progressBarStyleHorizontal"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="30dp" />



</RelativeLayout>