Android CheckBox 的使用案例分析

public class MainActivity extends Activity {
 TextView tv;
 CheckBox cb1;
 CheckBox cb2;

 

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

  cb1 = (CheckBox) findViewById(R.id.checkbox1);
  cb2 = (CheckBox) findViewById(R.id.checkbox2);
  tv = (TextView) findViewById(R.id.textview1);

  cb1.setOnCheckedChangeListener(cb);
  cb2.setOnCheckedChangeListener(cb);
 }

 private CheckBox.OnCheckedChangeListener cb = new CheckBox.OnCheckedChangeListener() {
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
   String stv = getString(R.string.hoby);
   String scb1 = getString(R.string.basketball);
   String scb2 = getString(R.string.football);
   if (cb1.isChecked() && cb2.isChecked()) {
    tv.setText(stv + ":" + scb1 + "&&" + scb2);
   } else if (cb1.isChecked() && !cb2.isChecked()) {
    tv.setText(stv + ":" + scb1);
   } else if (!cb1.isChecked() && cb2.isChecked()) {
    tv.setText(stv + ":" + scb2);
   } else {
    tv.setText(stv);
   }
  }
 };

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/textview1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hoby" />

    <CheckBox

        android:id="@+id/checkbox1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/basketball" />

    <CheckBox

        android:id="@+id/checkbox2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/football" />

</LinearLayout>