application全局变量

注意添加application android:name="YourAppName"
public class YourAppName extends Application {  private List<Item> mItems;  @Override  public void onCreate() {    super.onCreate();    mItems = getYourItemList();  }  public List<Item> getItems() {    return mItems;  }}

public class DetailActivity extends Activity {  private YourAppName mApp;  private ImageButton mNextButton;  private ImageButton mBackButton;  private TextView mTitle;  private int mIndex;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.your_layout);    mApp = (YourAppName) getApplication();    /*This index should come from the intent */    mIndex = 2;     getWidgets();    populateWidgets();  }  private void getWidgets() {    mNextButton = (ImageButton)findViewById(R.id.next);    mTitle = (TextView)findViewById(R.id.title);    /* other findViewById */    mNextButton.setOnClickListener(new OnClickListener() {        public void onClick(View v) {           mIndex++; /*Notice that this will get a NPE.                     You need to place a better logic here */           populateWidgets();        }    });  }  private void populateWidgets() {    Item item = mApp.getItemList().get(mItem);    mTitle.setText(item.getName());  }}

更多相关文章

随机推荐