常用控制元件:ProgressBar

核心程式碼:

檢視:

<!--長條形狀進度條-->
<ProgressBar
	android:id="@+id/firstBar"
	style="?android:attr/progressBarStyleHorizontal"
	android:layout_width="200dp"
	android:layout_height="wrap_content"
	android:visibility="gone"
	/>
<!--圓形狀進度條-->	
<ProgressBar
	android:id="@+id/secondBar"
	style="?android:attr/progressBarStyle"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:visibility="gone"
	/>
 

資料:

        private ProgressBar firstBar =null;
	private ProgressBar secondBar = null;

        //根據控制元件的ID來取得代表控制元件的物件
        firstBar = (ProgressBar)findViewById(R.id.firstBar);
        secondBar = (ProgressBar)findViewById(R.id.secondBar);
	//設定進度條處於可見的狀態
	firstBar.setVisibility(View.VISIBLE);
	firstBar.setMax(150);
	secondBar.setVisibility(View.VISIBLE);
	//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);

	//設定進度條處於不可見狀態
	firstBar.setVisibility(View.GONE);
	secondBar.setVisibility(View.GONE);
 

控制元件圖例:

具體應用:

XML檔案:

<?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"
    >
<!--長條形狀進度條-->
<ProgressBar
	android:id="@+id/firstBar"
	style="?android:attr/progressBarStyleHorizontal"
	android:layout_width="200dp"
	android:layout_height="wrap_content"
	android:visibility="gone"
	/>
<!--圓形狀進度條-->	
<ProgressBar
	android:id="@+id/secondBar"
	style="?android:attr/progressBarStyle"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:visibility="gone"
	/>
</LinearLayout>
 

Activity.java檔案:

package mars.progressbar;

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 {
    /** Called when the activity is first created. */
	//宣告變數
	private ProgressBar firstBar =null;
	private ProgressBar secondBar = null;
	private Button myButton = null;
	private int i = 0 ;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //根據控制元件的ID來取得代表控制元件的物件
        firstBar = (ProgressBar)findViewById(R.id.firstBar);
        secondBar = (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)
			{
				//設定進度條處於可見的狀態
				firstBar.setVisibility(View.VISIBLE);
				firstBar.setMax(150);
				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 ;
		}
    	
    }
    
}

專案檔案地址: