Cannot cast from View to ProgressBar的解决办法

package mars.progressbar;

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

public class ProgressBar extends Activity {
/** Called when the activity is first created. */
//声明变量
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);
//根据控件的ID来获取代表控件的对象
firstBar = (ProgressBarTest)findViewById(R.id.firstBar);
secondBar = (ProgressBarTest)findViewById(R.id.secondBar);
myButton = (Button)findViewById(R.id.myButton);
myButton.setOnClickListener(new ButtonListener());

}

红色部分一直提示Cannot cast from View to ProgressBar

 

原来是我命名类名跟调用的函数一样 起冲突了。

将ProgressBar类重新命名为ProgressBarTest  问题就解决了

 

public class ProgressBarTest extends Activity {
/** Called when the activity is first created. */
//声明变量
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);
//根据控件的ID来获取代表控件的对象
firstBar = (ProgressBar)findViewById(R.id.firstBar);
secondBar = (ProgressBar)findViewById(R.id.secondBar);
myButton = (Button)findViewById(R.id.myButton);
myButton.setOnClickListener(new ButtonListener());

}

OK  这样就行了。