新建android工程：


之后再新建一个class：任意起名（我的是Acitvity2),但是要继承activity；

同时在layout里面新建一个布局文件：



代码实现如下：maniactivity

public class MainActivity extends Activity {


private Button btn_startActivity2;

private TextView tv_out;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv_out=(TextView) findViewById(R.id.textView1);

btn_startActivity2=(Button) findViewById(R.id.btn_startActivity2);

btn_startActivity2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent=new Intent(MainActivity.this,Activity2.class);

//intent.putExtra("hello", "hello world!!!");

Bundle data=new Bundle();

data.putString("hello", "hello yaowen613@github.com!!!");

//data.putString("hello", "15626102810");

//data.putString("hello", "794365939");

intent.putExtras(data);

//startActivity(intent);

startActivityForResult(intent, 0);

}

});

}

//接收并处理返回的data；

@Override

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

// TODO Auto-generated method stub

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

tv_out.setText(result);

super.onActivityResult(requestCode, resultCode, data);

}


}



新建类的代码实现：

public class Activity2 extends Activity {


private TextView tv_out;

private Button btn_close;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.main2);

init();

}


private void init() {

// TODO Auto-generated method stub

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

//tv_out.setText(getIntent().getStringExtra("hello"));

Bundle data=getIntent().getExtras();

String hello=data.getString("hello");

tv_out.setText(hello);

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

btn_close.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent=new Intent();

intent.putExtra("result", "hello MainActivity");

//startActivity(intent);

setResult(0, intent);

finish();

}

});

}

}


布局文件就不用我上代码了，随便你们自己任意设计；


另外，这样直接运行，程序还是会抛异常强制退出，是因为新建的activity2这个class没有在manifest里面注册：注册方法就是在application标签里加入“<activity android:name=".Activity2"></activity>”这么一段话；如下图：：