Android Activity的啟動

首先新建一個(gè)android工程，然后新建一個(gè)aty類繼承Activity，然后在AndroidManifest.xml的 application標(biāo)簽中加上如下代碼：

 <activity android:name="aty"></activity>

然后新建一個(gè)main.xml,作為aty Activity 的布局文件

    其中MainActivity的代碼如下：

package com.example.startactivity;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

private Button btn1;

private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btn1=(Button) findViewById(R.id.btn1);

tv=(TextView) findViewById(R.id.tv1);

btn1.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

Intent i=new Intent(MainActivity.this,aty.class);

i.putExtra("hello", "hello world");//要傳的參數(shù)

Bundle data=new Bundle();

data.putString("hihi", "hihi");

i.putExtras(data);//可以傳大量數(shù)據(jù)

// startActivity(i);//無返回參數(shù)時(shí)，這樣啟動第二個(gè)activity

startActivityForResult(i, 0);

}

});

}

protected void onActivityResult(int requestCode, int resultCode, Intent data){

String result=data.getStringExtra("jgc");

tv.setText(result);

super.onActivityResult(requestCode, resultCode, data);

}

}

 aty.java的代碼如下：

package com.example.startactivity;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class aty extends Activity {

private Button btnclose;

private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btnclose=(Button) findViewById(R.id.btnclose);

btnclose.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

Intent i=new Intent();

i.putExtra("jgc","hello everybody");

setResult(0,i);

finish();//關(guān)閉activity

}

});

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

tv.setText(getIntent().getStringExtra("hello"));//接收并顯示參數(shù)

//接收大量數(shù)據(jù)的方式

Bundle data=getIntent().getExtras();

String str=data.getString("hihi");

tv.setText(str);

}

}

布局代碼就省略了。。。