@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

  myButton = (Button) findViewById(R.id.myButton);
  myButton.setOnClickListener(new MyButtonListener());
}


   class MyButtonListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            /*// 1.跳转到本程序的Activity
             * Intent intent=new Intent(); 
             * intent.putExtra("key", "DATA");
             * intent.setClass(MainActivity.this, OtherActivity.class);
             * MainActivity.this.startActivity(intent);
             */
　　　　　　　//2.跳转到外部Activity 如：发送短信
            Uri uri = Uri.parse("smsto://0800000123");
            Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
            intent.putExtra("sms_body", "The SMS text");
            startActivity(intent);
        }
    }

public class OtherActivity extends Activity{

  private TextView myTextView=null;

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

  setContentView(R.layout.other);
  Intent intent=getIntent();//获取Intent
  String value=intent.getStringExtra("key");
  myTextView=(TextView)findViewById(R.id.textView1);
  myTextView.setText(value);
 }
}