安卓基础开发

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Mainactivity.java 文件

package com.example.first;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

private Button btn;//1创建对象
private Button btn2;
    private EditText et1;
    private EditText et2;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //2对btn实例化
        btn=(Button)findViewById(R.id.btt1);
        btn2=(Button)findViewById(R.id.b2);
        //创建单击事件参数要传递匿名内部类
        et1=(EditText)findViewById(R.id.username);
        et2=(EditText)findViewById(R.id.password);
        btn.setOnClickListener(new OnClickListener(){
        public void onClick(View arg0)
        {
          String username=et1.getText().toString();
          String pwd=et1.getText().toString();
          if(username.equals("z3")&&pwd.equals("z3")){
           Intent in=new Intent(MainActivity.this,SecActivity.class);
              startActivity(in);
          }
          //再次方法内斜a>a
        //System.out.println("kkkkk");
          //要成功的跳转需要用intent这个对象第一个参数是原来的类出发站跳转的泪终点站

          //Intent in=new Intent(MainActivity.this,SecActivity.class);
          //startActivity(in);
        }

        });

btn2.setOnClickListener(new OnClickListener(){
public void onClick(View arg0){
  Intent in2=new Intent();
  in2.setAction(Intent.ACTION_CALL);
  in2.setData(Uri.parse("tel:13567823232"));
  startActivity(in2);

}

}
);

}//onCreate
}
第二个java文件

package com.example.first;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class SecActivity extends Activity {
List list;
private ListView userlv;
final static int menu_index=Menu.FIRST;
final static int menu_content=Menu.FIRST+1;
final static int menu_last=Menu.FIRST+2;
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_sec);
  userlv=(ListView)findViewById(R.id.list);
  list=new ArrayList();
  list.add("tom");
  list.add("jerry");
  list.add("jak");
  list.add("marry");
  list.add("join");
  ArrayAdapter<String> adapter =
                   new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list);
  userlv.setAdapter(adapter);


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.sec, menu);
  menu.add(0,menu_index,0,"首页").setIcon(android.R.drawable.btn_star);
  menu.add(0,menu_content,1,"内").setIcon(android.R.drawable.btn_star);
  menu.add(0,menu_last,2,"为页").setIcon(android.R.drawable.btn_star_big_off);
  return true;
}

/* (non-Javadoc)
* @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
//eturn super.onOptionsItemSelected(item);
  switch(item.getItemId()){
   case menu_index:
    System.out.println("menu_index");
    return true;
   case menu_content:
    System.out.println("menu_content");
    return true;
   case menu_last:
    System.out.println("menu_last");
    return true;
   default: return false;

  }
}
}

控件文件

</RelativeLayout>

控件文件