Android中GridView和ArrayAdapter用法实例分析

import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.GridView;import android.widget.TextView;public class A06Activity extends Activity { private TextView tv;//两个按钮是动态放入GridView的开关，b01是设置GridView为两列格式，并放入4//个item,b02设置为三列格式，并放入9个Item private Button b01,b02;// private GridView gv; private String[] s1,s2; private ArrayAdapter<String> aa;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    tv=(TextView)findViewById(R.id.tv);    b01=(Button)findViewById(R.id.button01);    b02=(Button)findViewById(R.id.button02);    gv=(GridView)findViewById(R.id.gv);    s1=new String[]{     getResources().getString(R.string.str_list01),     getResources().getString(R.string.str_list02),     getResources().getString(R.string.str_list03),     getResources().getString(R.string.str_list04)    };    s2=new String[]{     getResources().getString(R.string.str_list01),     getResources().getString(R.string.str_list02),     getResources().getString(R.string.str_list03),     getResources().getString(R.string.str_list04),     getResources().getString(R.string.str_list01),     getResources().getString(R.string.str_list02),     getResources().getString(R.string.str_list03),     getResources().getString(R.string.str_list04),     getResources().getString(R.string.str_list04)    };    b01.setOnClickListener(new OnClickListener(){  @Override  public void onClick(View v) {  // TODO Auto-generated method stub  gv.setNumColumns(2);  aa=new ArrayAdapter<String>(A06Activity.this,R.layout.list_item_l_small,s1);  gv.setAdapter(aa);  gv.setSelection(2);  gv.refreshDrawableState();  }  });  b02.setOnClickListener(new OnClickListener(){  @Override  public void onClick(View v) {  // TODO Auto-generated method stub  gv.setNumColumns(2);  aa=new ArrayAdapter<String>(A06Activity.this,R.layout.list_item_l_small,s2);  gv.setAdapter(aa);  }  });  //利用GridView的OnClickListener()方法用来捕捉用户单击的是哪个item  gv.setOnItemClickListener(new OnItemClickListener(){  @Override  public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,   long arg3) {  // 判断Adapter中元素的个数，判断被单击的是第几个元素的名称  switch(aa.getCount()){  case 4:   tv.setText(s1[arg2]);   break;  case 9:   tv.setText(s2[arg2]);   break;  }  }  });  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical" >  <TextView    android:id="@+id/tv"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="@string/hello" />  <Button     android:id="@+id/button01"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    />  <Button     android:id="@+id/button02"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    />  <GridView     android:id="@+id/gv"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    ></GridView></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><TextView   xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/myCheckedTextView1"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:textColor="@drawable/blue"  android:textSize="12dp"  android:textAppearance="@android:attr/textAppearanceLarge"  android:gravity="center_vertical"  android:paddingLeft="6dip"  android:minHeight="@android:attr/listPreferredItemHeight"/>