Android开发手记(7) 按钮类控件的使用

final RelativeLayout layout = (RelativeLayout)this.findViewById(R.id.layout);
final Button btnRed = (Button)this.findViewById(R.id.btnRed);

btnRed.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
layout.setBackgroundColor(Color.RED);
((Button)view).setText("Is Red");
}
});

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView result;
private RadioButton rbMale;
private RadioButton rbFemale;
private RadioGroup rGroup;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//        this.setTitle("Button");
setContentView(R.layout.activity_main);

result = (TextView)findViewById(R.id.textView);
rbMale = (RadioButton)findViewById(R.id.rbMale);
rbFemale = (RadioButton)findViewById(R.id.rbFemale);
rGroup = (RadioGroup)findViewById(R.id.rGroup);

rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
if(i==rbMale.getId()) {
result.setText("你的性别是：男");
}
else if(i==rbFemale.getId()){
result.setText("你的性别是：女");
}
}
});

}

}