在getView()時，通過判斷選擇加載不同的布局。

點擊某個item的時候，變為foucus狀態，其他的items還原。

下面用兩個方法給item設置兩個不同的布局。

//foucus狀態，顯示一個ImageViewprivate View addFocusView(int i) {ImageView iv = new ImageView(mContext);iv.setImageResource(R.drawable.ic_launcher);return iv;} //normal狀態顯示一個ImageView和一個TextViewprivate View addNormalView(int i) {LinearLayout layout = new LinearLayout(mContext);layout.setOrientation(LinearLayout.HORIZONTAL);ImageView iv = new ImageView(mContext);iv.setImageResource(R.drawable.ic);layout.addView(iv, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));TextView tv = new TextView(mContext);tv.setText(mData.get(i));layout.addView(tv, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));layout.setGravity(Gravity.CENTER);return layout;}

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FocusListViewAdapter.java

package sunny.example.ahfourlistviewfocus;import android.content.Context; import android.view.Gravity; 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.List;public class FocusListViewAdapter extends BaseAdapter {private List<String> mData;private Context mContext;private int mCurrentItem = 0;public FocusListViewAdapter(Context context, List<String> data) {this.mContext = context;this.mData = data;}public int getCount() {return mData.size();}public Object getItem(int position) {return mData.get(position);}public long getItemId(int position) {return position;}public View getView(int position, View convertView, ViewGroup parent) {LinearLayout layout = new LinearLayout(mContext);layout.setOrientation(LinearLayout.VERTICAL);if (mCurrentItem == position) {layout.addView(addFocusView(position));} else {layout.addView(addNormalView(position));}return layout;}public void setCurrentItem(int currentItem) {this.mCurrentItem = currentItem;} //foucus狀態，顯示一個ImageViewprivate View addFocusView(int i) {ImageView iv = new ImageView(mContext);iv.setImageResource(R.drawable.ic_launcher);return iv;} //normal狀態顯示一個ImageView和一個TextViewprivate View addNormalView(int i) {LinearLayout layout = new LinearLayout(mContext);layout.setOrientation(LinearLayout.HORIZONTAL);ImageView iv = new ImageView(mContext);iv.setImageResource(R.drawable.ic);layout.addView(iv, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));TextView tv = new TextView(mContext);tv.setText(mData.get(i));layout.addView(tv, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));layout.setGravity(Gravity.CENTER);return layout;} }

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activity_main.xml

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><ListViewandroid:id="@+id/focus_listView"android:layout_width="match_parent"android:layout_height="wrap_content" /> </LinearLayout>

MainActivity.java

package sunny.example.ahfourlistviewfocus;import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ListView;import java.util.ArrayList; import java.util.List;public class MainActivity extends ActionBarActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ListView listView = (ListView) findViewById(R.id.focus_listView);List<String> data = new ArrayList<String>();data.add("I am item 1");data.add("I am item 2");data.add("I am item 3");data.add("I am item 4");data.add("I am item 5");final FocusListViewAdapter adapter = new FocusListViewAdapter(this, data);/* public void setAdapter (ListAdapter adapter) Sets the data behind this ListView.*/listView.setAdapter(adapter);listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {adapter.setCurrentItem(position);////*void android.widget.BaseAdapter.notifyDataSetChanged() Notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself. */ //刷新布局adapter.notifyDataSetChanged();}});}}

foucus item3的情況

總結

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