android基础小例子1

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------------------------------------------------test_Activity ---------------------------------------------------

package com.android;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Display;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.LinearLayoumain.xmlt;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class test_Activity extends Activity {
    /** Called when the activity is first created. */

private LinearLayout ll;
private TextView tv01;
private ImageView iv01;
private RadioButton rb;
private RadioGroup rg01;
private String[] str=new String[]{"HTC","三星","摩托罗拉"};
private List<CheckBox> checkboxs = new ArrayList<CheckBox>();
    public String s="你选择的是：";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LayoutInflater li=this.getLayoutInflater();
        ll=(LinearLayout) li.inflate(R.layout.main, null);

        initComponent();

        //获取分辨率2012-2-19
       Display d=   this.getWindowManager().getDefaultDisplay();
       tv01.setText("手机的分辨率是："+d.getWidth()+"*"+d.getHeight());

       //为ImageView设置图片
        iv01.setImageResource(R.drawable.iconfull); //1
        iv01.setImageDrawable(getResources().getDrawable(R.drawable.iconfull));//2

       //RadioGroup
       rg01.setOnCheckedChangeListener(new OnCheckedChangeListener() {

   public void onCheckedChanged(RadioGroup group, int checkedId) {

    rb=(RadioButton) test_Activity.this.findViewById(group.getCheckedRadioButtonId());
    Toast.makeText(getApplicationContext(), rb.getText(), Toast.LENGTH_SHORT).show();
   }
    });

     //CheckBox
     for(int i=0;i<str.length;i++){
    final CheckBox c=new CheckBox(this);
    c.setText(str[i].toString());
    checkboxs.add(c);

    c.setOnClickListener(new OnClickListener() {

   public void onClick(View v) {
    for(CheckBox cb:checkboxs){
     if(cb.isChecked()){
      s+=cb.getText()+";";
     }
    }
    tv01.setText(s);
   }
  });
    ll.addView(c, 3);
     }

     //Activity跳转
Button btn=new Button(this);
btn.setText("跳转到ListView");
btn.setOnClickListener(new OnClickListener() {

  public void onClick(View v) {
   Intent intent=new Intent(test_Activity.this, ListView_Activity.class);
   intent.putExtra("aaa", "--------ListView-------");
   test_Activity.this.setResult(RESULT_OK,intent);
   startActivityForResult(intent, 6);
  }
});
ll.addView(btn);

     setContentView(ll);
    }

    //Activity跳转返回的函数
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode==6){
      Bundle b=data.getExtras();
      String str= b.getString("ListView");
      Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
    }
    super.onActivityResult(requestCode, resultCode, data);
    }

    //键盘事件
    @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    switch (keyCode) {
  case KeyEvent.KEYCODE_DPAD_UP:
   Button b=new Button(this);
   b.setText("添加按钮");
   ll.addView(b);
   break;
  case KeyEvent.KEYCODE_DPAD_DOWN:
   Toast.makeText(this, "不能浪费时间", Toast.LENGTH_SHORT).show();
   break;

  }


  return super.onKeyDown(keyCode, event);
}

//初始化组件
    public void initComponent(){
    tv01=(TextView) ll.findViewById(R.id.tv01);//分辨率
        iv01=(ImageView) ll.findViewById(R.id.iv01);//图片
        rg01=(RadioGroup) ll.findViewById(R.id.rg01);//RadioGroup


    }


}

------------------------------------------------------ListView_Activity ------------------------------------------------------------------

package com.android;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class ListView_Activity extends Activity {
    /** Called when the activity is first created. */

private LinearLayout ll;
private TextView tv01;
private Intent intent;
private ListView lv01;
List<Map<String, Object>> list=new ArrayList<Map<String,Object>>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LayoutInflater li=this.getLayoutInflater();
        ll=(LinearLayout) li.inflate(R.layout.listview, null);

        //得到父Activity传过来的Intent
        intent= this.getIntent();
        tv01=(TextView) ll.findViewById(R.id.tv01);
        Bundle b=intent.getExtras();
        tv01.setText(b.getString("aaa"));

         //子Activity回跳
         Button btn=new Button(this);
    btn.setText("跳转到ListView");
    btn.setOnClickListener(new OnClickListener() {

      public void onClick(View v) {

        intent.putExtra("ListView", "---**---ListView---**--");
        ListView_Activity.this.setResult(RESULT_OK,intent);
        ListView_Activity.this.finish();
       }
     });

    //ListView
    lv01=(ListView) this.findViewById(R.id.listv01);
    //准备数据
    Map<String, Object> map=new HashMap<String, Object>();

         map.put("img", R.drawable.p01);
         map.put("str", "多功能日历");
         list.add(map);

         map=new HashMap<String, Object>();
         map.put("img", R.drawable.p02);
         map.put("str", "emoMarke客户端");
         list.add(map);

         map=new HashMap<String, Object>();
         map.put("img", R.drawable.p03);
         map.put("str", "重力消砖");
         list.add(map);

         map=new HashMap<String, Object>();
         map.put("img", R.drawable.p04);
         map.put("str", "白社会");
         list.add(map);

         map=new HashMap<String, Object>();
         map.put("img", R.drawable.p05);
         map.put("str", "程序终结者");
         list.add(map);

         SimpleAdapter sa=new SimpleAdapter(this, list, R.layout.listviewitem, new String[]{"img","str"}, new int[]{R.id.img,R.id.tvinfo});
         lv01.setAdapter(sa);
         lv01.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {

    Toast.makeText(getApplicationContext(), "你点击的是几"+position+"行，"+list.get(position).get("str"), Toast.LENGTH_SHORT).show();
   }
  });

    ll.addView(btn);

        setContentView(ll);


    }

}

---------------------------------------------------------main.xml-------------------------------------------------------------

<?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" >

---------------------------------------------------------listview.xml-------------------------------------------------------------

----------------------------------------------------------listviewitem.xml------------------------------------------------------------