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如何运用相对布局(Relative Layout)

2011-08-30 16:37 309 查看

list.xml代码

<?xml version="1.0" encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

    android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView android:id="@+id/text"

             android:layout_width="wrap_content"

     android:layout_height="wrap_content"

             android:text="Hello World, ex07" />

<ListView android:id="@+id/list"

             android:layout_width="wrap_content"

     android:layout_height="wrap_content" />

</LinearLayout>

Ex07Activity.java

public class Ex07Activity extends Activity implements OnItemClickListener {

//WRAP_CONTENT = -2:Special value for the height or width requested by a View

private final int WC = ViewGroup.LayoutParams.WRAP_CONTENT;

//准备Adapter数据库

private String[] data = {" Item-1 ", " Item-2 ", " Item-3 "};

private TextView tv;

private ArrayAdapter<String> adapter;

private boolean[] status = {false, false, false };

@Override

public void onCreate(Bundle bundle) {

super.onCreate(bundle);

//相对布局对象

RelativeLayout r_layout = new RelativeLayout(this);

//设置布局

setContentView(r_layout);

//这个类被用于把一个XML文件实例化到相应的视图对象中。Context.LAYOUT_INFLATER_SERVICE = layout_inflater

LayoutInflater inflate = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);

//得到水平布局对象

LinearLayout layout = (LinearLayout)inflate.inflate(R.layout.list, null);

//和相对布局有联系的每个子布局信息

RelativeLayout.LayoutParams param= new RelativeLayout.LayoutParams(175, WC);

layout.setId(1);

r_layout.addView(layout, param);

tv = (TextView)layout.findViewById(R.id.text);

//列表

ListView lv = (ListView)layout.findViewById(R.id.list);

lv.setBackgroundResource(R.drawable.icon);

adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, data);

lv.setAdapter(adapter);

lv.setItemsCanFocus(false);

lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

lv.setOnItemClickListener( this);

Button btn1 = new Button(this);

btn1.setBackgroundResource(R.drawable.icon);

btn1.setId(2);

btn1.setText("OK");

btn1.setOnClickListener((android.view.View.OnClickListener) listener);

param= new RelativeLayout.LayoutParams(60, WC);

param.addRule(RelativeLayout.RIGHT_OF, 1);

param.leftMargin = 15; param.topMargin = 20;

r_layout.addView(btn1, param);

Button btn2 = new Button(this);

btn2.setBackgroundResource(R.drawable.icon);

btn2.setId(3); btn2.setText("Exit");

btn2.setOnClickListener((android.view.View.OnClickListener) listener);

param= new RelativeLayout.LayoutParams(60, WC);

param.addRule(RelativeLayout.BELOW, 2);

param.addRule(RelativeLayout.ALIGN_LEFT, 2);

param.topMargin = 25;

r_layout.addView(btn2, param);

}

OnClickListener listener = new OnClickListener() {

public void onClick(View v) {

if(v.getId() == 2){

String ss = "{";

for(int i=0; i< adapter.getCount(); i++){

if(status[i]) {

ss += data[i];

ss += " ";

}

}

ss += "}";

setTitle(ss);

}else if(v.getId() == 3) finish();

}};

public void onItemClick(AdapterView<?> arg0, View v, int idx, long arg3) {

status[idx] = !status[idx];

}

}

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