Android群英传——第四章动态改变ListView的布局

看效果： 

看代码：

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by feathers on 16-11-15.
 */

public class MyAdapter extends BaseAdapter {

    private Context mContext;
    private ArrayList<String> mData = null;
    private int mCurrentItem = 0;

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

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

    @Override
    public Object getItem(int i) {
        return mData.get(i);
    }

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

    @Override
    public View getView(int position, View view, ViewGroup viewGroup) {
        LinearLayout linearLayout = new LinearLayout(mContext);
        linearLayout.setOrientation(LinearLayout.VERTICAL);
        // 判断是否是选中的item
        if (mCurrentItem == position) { // 是则为一种布局
            linearLayout.addView(addFocusView(position));
        } else { // 不是则为另一个布局
            linearLayout.addView(addNormalView(position));
        }
        return linearLayout;
    }

    private View addFocusView(int i) {
        ImageView iv = new ImageView(mContext);
        iv.setImageResource(R.mipmap.ic_launcher);
        return iv;
    }

    private View addNormalView(int i) {
        TextView tv = new TextView(mContext);
        tv.setText((String)getItem(i));
        return tv;
    }

    // 暴露方法，让setOnItemClickChanageListener决定当前时哪个item被选中
    public void setCurrentItem(int currentItem) {
        this.mCurrentItem = currentItem;
        this.notifyDataSetChanged();
    }
}

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MainActivity.Java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private ListView mListView;

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

        mListView = (ListView) findViewById(R.id.listView);

        ArrayList<String> mData = new ArrayList<>();
        for (int i = 0; i < 30; i++) {
            mData.add("我是Item" + i);
        }
        final MyAdapter adapter = new MyAdapter(this, mData);
        mListView.setAdapter(adapter);

        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                // 注意 
                adapter.setCurrentItem(i);
            }
        });
    }
}