ListView点击Item更换显示内容图片

先上效果图

布局文件（就是一个listView）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>

activity中的代码，模拟的假数据设置listView

private ListView lv;
private ArrayList<String> list;
private MyAdapter adapter;

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

}

private void initLayout() {
if(list == null){
list = new ArrayList<>();
}

for (int i = 0; i < 20; i++) {
list.add("正常显示.....");
}

lv = (ListView) findViewById(R.id.lv);
adapter = new MyAdapter(list,this);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
adapter.setCurrentPosition(position);
adapter.notifyDataSetChanged();
}
});
}

设置Adapter,主要的点击和切换事件都在这里面,这里是通过动态来添加布局内容的

public class MyAdapter extends BaseAdapter {

int mCurrentPos;
ArrayList<String> list;
Context mContext;

public MyAdapter(ArrayList<String> list,Context context) {
this.list = list;
this.mContext = context;
}

public void setCurrentPosition(int position){
this.mCurrentPos = position;
}

@Override
public int getCount() {
return list.size();
}

@Override
public Object getItem(int position) {
return list.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout layout = new LinearLayout(mContext);
layout.setOrientation(LinearLayout.VERTICAL);

//说明点击的是当前的位置,设置为获取焦点
if(mCurrentPos == position){
layout.addView(addFocusView());
}else{
layout.addView(addNormalView(position));
}
layout.setGravity(Gravity.CENTER);

return layout;
}

/**
* 获取焦点的位置
*/
public View addFocusView(){
ImageView iv = new ImageView(mContext);
iv.setLayoutParams(new LinearLayout.LayoutParams(150,150));
iv.setImageResource(R.drawable.focus);
return iv;
}

/**
* 正常情况下listView的内容显示
*/
public View addNormalView(int position){
LinearLayout layout  = new LinearLayout(mContext);
layout.setOrientation(LinearLayout.HORIZONTAL);
ImageView iv = new ImageView(mContext);
iv.setImageResource(R.drawable.nomal);
layout.addView(iv, new LinearLayout.LayoutParams(150,150));
TextView tv  = new TextView(mContext);
tv.setText(list.get(position));
tv.setTextSize(30);
layout.addView(tv,new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
layout.setGravity(Gravity.CENTER);
return layout;
}
}