从一个Activity打开另外一个Activity

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    
    public void openActivity(View v){
        //打开新的Activity
        Intent intent = new Intent(this, OtherActivity.class);//激活组件,显示意图:明确指定了组件名称的意图叫显示意图
        //关于指定组件名称，还有很多写法
        //1> intent.setClass(this, OtherActivity.class);//指定要激活的组件名称
        //2> intent.setClassName(this, "cn.itcast.activitys.OtherActivity");//还可以激活别的应用的Activity
        //3> intent.setComponent(new ComponentName(this, OtherActivity.class));
        // intent.setClassName(this, "cn.itcast.activitys.OtherActivity");
        /*
        intent.putExtra("company", "传智播客");
        intent.putExtra("age", 5);
        */
        Bundle bundle = new Bundle();
        bundle.putString("company", "CSDN");
        bundle.putInt("age", 11);
        intent.putExtras(bundle);
        
        //startActivity(intent);
        startActivityForResult(intent, 100);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        String result = data.getStringExtra("result");
        Toast.makeText(getApplicationContext(),result, 1).show();
        
        super.onActivityResult(requestCode, resultCode, data);
    }
    
    
}

public class OtherActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.other);
        
        TextView textView = (TextView) this.findViewById(R.id.textView);
        
        Intent intent = getIntent();//获取用于激活它的意图对象
    /*    String company = intent.getStringExtra("company");
        int age = intent.getIntExtra("age", 0);
    */
        Bundle bundle = intent.getExtras();
        String company = bundle.getString("company");
        int age = bundle.getInt("age");
        
        textView.setText("公司名称："+ company+ ",年限："+ age);
    }

    public void closeActivity(View v){
        Intent intent = new Intent();
        intent.putExtra("result", "老方与丽丽的故事，后面省略2000字");
        setResult(20, intent);//设置返回数据
        finish();//关闭Activity(关闭窗口)
    }
}