Question

安卓开发 按钮事件到底怎么破？ 连上调试是进程有错误。。。

package com.example.aaa;

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.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
import android.os.Build;

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViews();

}

private void findViews(){
Button button=(Button)findViewById(R.id.button01);
button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {

CharSequence text=((Button)v).getText();
Toast.makeText(MainActivity.this,
"你点了我",
Toast.LENGTH_SHORT)
.show();

}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}

/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {

public PlaceholderFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}

}

Answer 1

Button 定义成 全局变量试试。

Answer 2

　　上面的代码没有错，看看 PlaceholderFragment 类，是否在调用的时候出错，自己在Logcat看一下错误信息，一般都有错误行号的