button绑定监听器一直无法运行
代码如下:
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ProgressBar;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
ProgressBar firstBar = null;
ProgressBar secondBar = null;
Button myButton = null;
int i = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
firstBar = (ProgressBar) findViewById(R.id.firstBar);
secondBar = (ProgressBar) findViewById(R.id.secondBar);
myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(new ButtonListener()); //屏蔽这句就可以运行
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
class ButtonListener implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(i == 0)
{
firstBar.setVisibility(View.VISIBLE);
secondBar.setVisibility(View.VISIBLE);
}
else if(i<firstBar.getMax())
{
firstBar.setProgress(i);
firstBar.setSecondaryProgress(i+10);
}
else
{
firstBar.setVisibility(View.GONE);
secondBar.setVisibility(View.GONE);
}
i += 10;
}
}
看网上说的要导入
import android.view.View;
import android.view.View.OnClickListener;
这个包已经加入,可还是无法运行,新手,大家帮我能帮我分析分析么?