Android开发之BaseApdater

来源：互联网发布：数据挖掘韩家炜 ppt 编辑：程序博客网时间：2024/06/05 10:37

概要

SimpleAdapter和BaseAdapter都可以用于实现相同功能，但是相比较而言我比较喜欢BaseAdapter，都是java代码操作，没那么多xml文件要写。

概要步骤：

这里没什么步骤，无非是在布局里添加一个ListView之类的，我把BaseApdater的构造函数解释一下就完事了。

BaseAdapter ba = new BaseAdapter(){

@Override

public int getCount() {

return 4;//ListView中有几条数据要显示

}

@Override

public Object getItem(int position) {

return null;

}

@Override

public long getItemId(int position) {

return 0;

}

@Override

public View getView(int position, View convertView, ViewGroupparent) {

//这里定义了每一项显示的内容是什么

}

};

完整代码

public class ListViewActivity extends Activity {

private OnItemSelectedListeneritemSelectedListener;

private OnItemClickListeneritemClickListener;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.listview);

initListView();

}

public void initListView(){

final int[] images = {R.drawable.bluebutton,R.drawable.greenbutton,R.drawable.imagebutton,R.drawable.imagebuttondown};

final int[] strings = {R.string.image1,R.string.image2,R.string.image3,R.string.image4};

ListView lv = (ListView) this.findViewById(R.id.listview);

itemSelectedListener = new OnItemSelectedListener(){

@Override

public void onItemSelected(AdapterView<?> arg0, View arg1,

int arg2,long arg3) {

LinearLayout ll = (LinearLayout) arg1;

TextView tv = (TextView) ll.getChildAt(1);

Toast.makeText(ListViewActivity.this, tv.getText(),1000).show();

}

@Override

public void onNothingSelected(AdapterView<?> arg0) {

}

};

itemClickListener = new OnItemClickListener(){

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

LinearLayout ll = (LinearLayout) arg1;

TextView tv = (TextView) ll.getChildAt(1);

Toast.makeText(ListViewActivity.this, tv.getText(),1000).show();

}

};

BaseAdapter ba = new BaseAdapter(){

@Override

public int getCount() {

return 4;

}

@Override

public Object getItem(int position) {

return null;

}

@Override

public long getItemId(int position) {

return 0;

}

@Override

public View getView(int position, View convertView, ViewGroupparent) {

LinearLayout ll = new LinearLayout(ListViewActivity.this);

ll.setOrientation(LinearLayout.HORIZONTAL);

ll.setPadding(5, 5, 5, 5);

ImageView iv = new ImageView(ListViewActivity.this);

iv.setImageDrawable(getResources().getDrawable(images[position]));

iv.setScaleType(ImageView.ScaleType.FIT_XY);

iv.setLayoutParams(new Gallery.LayoutParams(100, 98));

ll.addView(iv);

TextView tv = new TextView(ListViewActivity.this);

tv.setText(getResources().getText(strings[position]));

tv.setTextSize(24);

tv.setPadding(5, 5, 5, 5);

tv.setGravity(Gravity.LEFT);

ll.addView(tv);

return ll;

}

};

lv.setAdapter(ba);

lv.setOnItemSelectedListener(itemSelectedListener);

lv.setOnItemClickListener(itemClickListener);

}

运行效果图

0 0