android学习笔记12(ProgressBar--进度条--初级学习)

MyProgressBar.java

package tk.progressbar;

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 MyProgressBar extends Activity {

    private ProgressBar firstBar=null; 
    private ProgressBar secondbBar=null; 
    private Button myButton=null; 
    private int i=0; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.progress_bar); 
        firstBar  =  (ProgressBar)findViewById(R.id.firstBar); 
        secondbBar = (ProgressBar)findViewById(R.id.secondBar); 
        myButton=(Button)findViewById(R.id.myButton); 
        myButton.setOnClickListener(new ButtonListener()); 
    } 
    class ButtonListener implements OnClickListener{

        @Override 
        public void onClick(View v) { 
            
            if(i==0){ 
                
                firstBar.setVisibility(View.VISIBLE); 
                secondbBar.setVisibility(View.VISIBLE); 
                firstBar.setProgress(i); 
                firstBar.setSecondaryProgress(i); 
            }else if(i<firstBar.getMax()){ 
                firstBar.setProgress(i); 
                firstBar.setSecondaryProgress(i 10); 
                secondbBar.setProgress(i); 
            }else{ 
                firstBar.setVisibility(View.GONE); 
                secondbBar.setVisibility(View.GONE); 
                i=-10; 
            } 
            i =10; 
        } 
        
    
    }

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.progress_bar, menu); 
        return true; 
    } 
}

progress_bar.xml

<?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:id="@ id/textView1" 
            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" 
            android:max="200" 
            /> 
        <ProgressBar 
            android:id="@ id/secondBar" 
            style="?android:attr/progressBarStyle" 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:visibility="gone" 
            /> 
        <Button 
            android:id="@ id/myButton" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="begin" 
            /> 
                
</LinearLayout>