android Progress进度条使用

首先是Progress的布局

相关参数有

1：style="?android:attr/progressBarStyleHorizontal"--------设置进度条显示的样式（水平方向的）

2：android:visibility="gone"---------设置为不可见

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<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="200dp"
	android:layout_height="wrap_content"
	android:visibility="gone"
    />
<Button
	android:id="@+id/myButton"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="@string/progressBar_Button_Name"
	/>
</LinearLayout>

 然后通过Activity调用布局文件

android进度条的默认大小为100；可以通过setProgress(int i);设置进度大小

并且android进度条默认是不可见的可以通过Progress.setVisibility(View.VISIBLE);设置可见

也可以设置为不可见：Progress.setVisibility(View.GONE);

package zhou.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class ProgressBarTest extends Activity {
    //对控件进行声明
	private ProgressBar firstBar = null;
	private ProgressBar secondBar = null;
	private Button myButton = null;
	private int i = 0;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //根据控件的ID来取得控件对象
        firstBar = (ProgressBar)this.findViewById(R.id.firstBar);
        secondBar = (ProgressBar)findViewById(R.id.secondBar);
        myButton  = (Button)findViewById(R.id.myButton);
        myButton.setOnClickListener(new OnClickListener(){
			public void onClick(View v) {
				if(i == 0){
					//设置进度条可见
					firstBar.setVisibility(View.VISIBLE);
					secondBar.setVisibility(View.VISIBLE);
				}else if(i < 100){
					firstBar.setProgress(i);
					firstBar.setSecondaryProgress(i+5);
					secondBar.setProgress(i);
				}else{
					//设置进度条不可见
					firstBar.setVisibility(View.GONE);
					secondBar.setVisibility(View.GONE);
				}
				i += 10;
			}
        	
        });
    }
}