Pass data when returning to Activity

The back operation is to carry data: select contacts in the address book, quick reply, etc.

MainActivity.java

public void click(View c){
        //跳转至选择联系人Activity
        Intent intent = new Intent(this,ContactActivity.class);
        startActivity(intent);
    //用这个api启动的Activity，在销毁时，系统会回调onActivityResult
        startActivityForResult(intent, 10);
    }

startActivityForResult(intent, 10);//Request data

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);

        String name = data.getStringExtra("name");
        if(requestCode == 10){
            EditText et = (EditText)findViewById(R.id.et);
            et.setText(name);
        }
        else if(requestCode == 20){
            EditText et_content = (EditText)findViewById(R.id.et_content);
            et_content.setText(name);
        }
    }

ContactActivity.java

@Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact);

        ListView lv = (ListView) findViewById(R.id.lv);

        final String[] objects = new String[]{
                "小明",
                "张三",
                "李四",
                "王五"
        };

        lv.setAdapter(new ArrayAdapter<String>(this,R.layout.item_listview, R.id.tv, objects));
        //给listview设置条目的点击侦听
        lv.setOnItemClickListener(new OnItemClickListener() {

            //当某个条目被点击时，此方法调用
            @Override
            public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
                //Activity返回时传递数据，也是通过意图对象
                Intent data = new Intent();
                //把要传递的数据封装至意图对象中
            data.putExtra("name",objects[position]);
                //当前Activity销毁时，data这个意图就会传递给启动当前Activity的那个Activity
                setResult(1, data);
                //销毁当前Activity
                finish();
            }
        });
    }

    @Override
    public void onBackPressed() {
        // TODO Auto-generated method stub
        super.onBackPressed();
    }