GridView 实现单选

最新推荐文章于 2016-11-21 11:12:49 发布

原创最新推荐文章于 2016-11-21 11:12:49 发布 · 332 阅读

CC 4.0 BY-SA版权

本文介绍了一种使用Android中的GridView实现单选按钮效果的方法。通过自定义GridItem类继承RelativeLayout并实现Checkable接口来控制选中状态的显示，并在Adapter中设置初始选中项和点击监听，以确保每次只能选择一个项。

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GridView实现单选效果

public class MainActivity extends Activity {
private GridView gridview;

private int checked = 3;
private GridItem last;

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

class ImageAdapter extends BaseAdapter {

private Context context;

//添加图片

private Integer[] mImageIds = { R.drawable.puzzle_00,
R.drawable.puzzle_01, R.drawable.puzzle_02,
R.drawable.puzzle_03, R.drawable.puzzle_04,
R.drawable.puzzle_05, R.drawable.puzzle_06,
R.drawable.puzzle_07, R.drawable.puzzle_08,
R.drawable.puzzle_09, R.drawable.puzzle_10,
R.drawable.puzzle_11, R.drawable.puzzle_12,
R.drawable.puzzle_13, R.drawable.puzzle_14,
R.drawable.puzzle_15, R.drawable.puzzle_16,
R.drawable.puzzle_17, R.drawable.puzzle_18,
R.drawable.puzzle_19, R.drawable.puzzle_20,
R.drawable.puzzle_21, R.drawable.puzzle_22,
R.drawable.puzzle_23, };

public ImageAdapter(Context context) {
this.context = context;

}

@Override
public int getCount() {
return mImageIds.length;
}

@Override
public Integer getItem(int position) {
return Integer.valueOf(mImageIds[position]);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

GridItem griditem;

if (convertView == null) {

griditem = new GridItem(context);
griditem.setLayoutParams(new GridView.LayoutParams(150, 200));
} else {
griditem = (GridItem) convertView;
}

griditem.setBg(getItem(position));

if (position != checked) {

griditem.setChecked(false);
}
return griditem;
}

}

gridview = (GridView) findViewById(R.id.images);
gridview.setAdapter(new ImageAdapter(this));

gridview.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {

if (last != null)
last.setChecked(false);

GridItem griditem = (GridItem) v;
griditem.setChecked(true);

checked = position;
last = (GridItem) v;
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

class GridItem extends RelativeLayout implements Checkable {

private ImageView image;
private ImageView selected_icon;
private boolean isChecked = false;

public GridItem(Context context) {
super(context);

LayoutInflater.from(context).inflate(R.layout.grid_item, this);
image = (ImageView) findViewById(R.id.image);
selected_icon = (ImageView) findViewById(R.id.selected_icon);
}

@Override
public boolean isChecked() {
return isChecked;
}

@Override
public void setChecked(boolean checked) {
isChecked = checked;

if (true == checked) {
selected_icon.setVisibility(View.VISIBLE);

} else {
selected_icon.setVisibility(View.GONE);

}

}

@Override
public void toggle() {

isChecked = !isChecked;

if (true == isChecked) {

selected_icon.setVisibility(View.VISIBLE);

} else {
selected_icon.setVisibility(View.GONE);

}
}

public void setBg(int resId) {
if (image != null) {
image.setBackgroundResource(resId);
}
}

}