006.高级控件的使用(基础--案例)
(1)ListView
实现如下：
MainActivity.java
public class MainActivity extends Activity {
private ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listview);
String[] title = this.getResources().getStringArray(R.array.title);
String[] content = this.getResources().getStringArray(R.array.content);
int[] image = { R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher };
MyAdapter adapter = new MyAdapter(this, image, title, content);
lv.setAdapter(adapter);
}
}
MyAdapter.java
package com.example.listview_adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
private Context context;
private int[] image;
private String[] title;
private String[] content;
public MyAdapter(Context context, int[] image, String[] title,
String[] content) {
// TODO Auto-generated constructor stub
this.context = context;
this.image = image;
this.title = title;
this.content = content;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
ViewHolder holder;
holder = new ViewHolder();
if (arg1 == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
arg1 = inflater.inflate(R.layout.listadapter_item, null);
holder.imagView = (ImageView) arg1.findViewById(R.id.img1);
holder.tv_title = (TextView) arg1
.findViewById(R.id.listadapter_item_tv_title);
holder.tv_content = (TextView) arg1
.findViewById(R.id.listadapter_item_tv_content);
arg1.setTag(holder);
} else {
holder = (ViewHolder) arg1.getTag();
}
holder.imagView.setImageResource(image[position]);
holder.tv_title.setText(title[position]);
holder.tv_content.setText(content[position]);
return arg1;
}
private static class ViewHolder {
private ImageView imagView;
private TextView tv_title;
private TextView tv_content;
}
}
listadapter_item.xml
<?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="horizontal" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/img1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/des" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/listadapter_item_tv_title"
android:layout_width="wrap_content"
android:layout_height="0dip"
android:layout_weight="1" />
<TextView
android:id="@+id/listadapter_item_tv_content"
android:layout_width="wrap_content"
android:layout_height="0dip"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:gravity="right" >
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
activity_main.xml
<ListView
android:id="@+id/listview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
(2)SpinnerView
MainActivity.java
public class MainActivity extends Activity {
private Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner) findViewById(R.id.spinner1);
String[] data= this.getResources().getStringArray(R.array.data);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,data);
spinner.setAdapter(adapter);
}
activity_main.xml
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
(3)GridView
MainActivity.java
public class MainActivity extends Activity {
private GridView gView;
private ImageView imageView;
private List<Map<String, Object>> list;
private Map<String, Object> map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gView = (GridView) findViewById(R.id.gv);
imageView = (ImageView) findViewById(R.id.iv2);
final int[] data = { R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher };
list = new ArrayList<Map<String, Object>>();
for (int i = 0; i < data.length; i++) {
map = new HashMap<String, Object>();
map.put("img", data[i]);
list.add(map);
}
SimpleAdapter simpleAdapter = new SimpleAdapter(this, list,
R.layout.lay_textview, new String[] { "img" },
new int[] { R.id.iv });
gView.setAdapter(simpleAdapter);
gView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// Toast.makeText(MainActivity.this,"这是第"+arg2+"张图",Toast.LENGTH_SHORT).show();
imageView.setImageResource(data[arg2]);
}
});
}
}
activity_main.java
<LinearLayout 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"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<GridView
android:id="@+id/gv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numColumns="3" >
</GridView>
<ImageView
android:id="@+id/iv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
testimg.xml
<?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" >
<ImageView
android:id="@+id/iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
(4)Gallery
MainActvity.java
public class MainActivity extends Activity {
private Gallery gallery;
private MyAdapter myAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gallery = (Gallery) findViewById(R.id.gallery);
final int[] data = { R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher };
myAdapter = new MyAdapter(this,data);
gallery.setAdapter(myAdapter);
}
MyAdapter.java
public class MyAdapter extends BaseAdapter {
private Context context;
private int[] data;
public MyAdapter(Context context, int[] data) {
this.context = context;
this.data = data;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return data.length;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
LinearLayout linearLayout = new LinearLayout(context);
linearLayout.setLayoutParams(new Gallery.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
ImageView imageView = new ImageView(context);
imageView.setImageResource(data[arg0]);
imageView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
linearLayout.addView(imageView);
return linearLayout;
}
}
activity_main.java
<Gallery
android:id="@+id/gallery"
android:layout_width="match_parent"
android:layout_height="match_parent" />