Activity 数据回传

 1 package com.example.metrox.l6;
 2 
 3 import android.content.Intent;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.TextView;
 8 
 9 public class MainActivity extends AppCompatActivity {
10 
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.activity_main);
15         findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
16             @Override
17             public void onClick(View view) {
18                 Intent i = new Intent(MainActivity.this,Main2Activity.class);
19                 startActivityForResult(i,0);
20             }
21         });
22     }
23 
24     @Override
25     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
26         super.onActivityResult(requestCode, resultCode, data);
27         TextView tv = (TextView) findViewById(R.id.textView);
28         tv.setText(data.getStringExtra("data"));
29     }
30 }

 1 package com.example.metrox.l6;
 2 
 3 import android.content.Intent;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.EditText;
 8 
 9 public class Main2Activity extends AppCompatActivity {
10 
11     private  EditText editText;
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main2);
16         findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
17             @Override
18             public void onClick(View view) {
19                 Intent i = new Intent();
20                 editText = (EditText)findViewById(R.id.editText);
21                 i.putExtra("data", editText.getText().toString());
22                 setResult(1,i);
23                 finish();
24             }
25         });
26     }
27 }