Android Activity跳转的小结

核心提示：setResult(Activity.RESULT_OK,i);finish();第二个例子：demo2Main—>SecondActivity—>ThirdActivity—>Main这个例子的流程，比上一个更复杂一些，Android Activity跳转的小结(4)，经历了3个Activity，最

setResult(Activity.RESULT_OK,i);

finish();

第二个例子：demo2

Main—>SecondActivity—>ThirdActivity—>Main

这个例子的流程，比上一个更复杂一些，经历了3个Activity，最好跳转回第一个Activity。

代码如下：

Java代码

public class Main extends Activity {

private Button btn;

private TextView request_text;

private final int FIRST_REQUEST_CODE = 1;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

request_text = (TextView)this.findViewById(R.id.request_text);

btn = (Button)this.findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

Intent i = new Intent(Main.this,SecondActivity.class);

i.putExtra("request_text_for_main", "从Main传递到SecondActivity");

startActivityForResult(i, FIRST_REQUEST_CODE);

}

});

}

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

super.onActivityResult(requestCode, resultCode, data);

if(requestCode==FIRST_REQUEST_CODE && resultCode==Activity.RESULT_FIRST_USER){

if(data != null) {

request_text.setText(data.getStringExtra("request_text_for_third"));

}

}

}

}

public class Main extends Activity {

private Button btn;

private TextView request_text;

private final int FIRST_REQUEST_CODE = 1;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);