activity通过onActivityResult间数据交互

package com.tp.soft.app;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener{

    private Button mTzBtn;
    private TextView mShow;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mTzBtn = (Button) findViewById(R.id.tzBtn);
        mTzBtn.setOnClickListener(this);
        
        mShow = (TextView) findViewById(R.id.showMsg);
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == 1){
            String msg = data.getStringExtra("FromOneActivity");
            mShow.setText(msg);
        }
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(MainActivity.this, OneActivity.class);
        String content = "Hello,OneActivity";
        intent.putExtra("FromMainActivity", content);
        startActivityForResult(intent, 1);
    }

}

package com.tp.soft.app;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class OneActivity extends Activity implements OnClickListener {
    
    private Button mbackBtn;
    private TextView mShow;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_one);

        mbackBtn = (Button) findViewById(R.id.backBtn);
        mbackBtn.setOnClickListener(this);
        
        mShow = (TextView) findViewById(R.id.showTxt);
        Intent intent = getIntent();
        String show = intent.getStringExtra("FromMainActivity");
        mShow.setText(show);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.one, menu);
        return true;
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(OneActivity.this, MainActivity.class);
        intent.putExtra("FromOneActivity", "Hello,MainActivity");
        setResult(RESULT_OK, intent);
        finish();
    }

}