android_11 activityA调activityB，再返回activityA

ButtonDemoActivity(activityA)

在之前代码的基础上加这个

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package com.mhm.button.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class ButtonDemoActivity2 extends Activity {private TextView tv;private Button btn_save_2;private Button btn_back;private String str;public static final int RESULT_CODE = 1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main2);//接收到activityA传递过来的参数Intent intent = getIntent();Bundle b = intent.getExtras();str = b.getString("str");tv = (TextView)findViewById(R.id.tv_sec);tv.setText(str);btn_save_2 = (Button)findViewById(R.id.save_sec);btn_save_2.setOnClickListener(listener);btn_back = (Button)findViewById(R.id.btn_back);btn_back.setOnClickListener(listener);}private OnClickListener listener = new OnClickListener() {public void onClick(View v) {Button b = (Button)v;switch (b.getId()) {case R.id.save_sec:Toast t = Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT);t.show();break;case R.id.btn_back:Intent intent = new Intent();System.out.println("back");intent.putExtra("back", "我是从B返回到A的值");setResult(RESULT_CODE, intent);//结束此activity，返回到activityAfinish();break;default:break;}}};}

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