startActivityForResult 页面跳转回调

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import java.io.Serializable;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.content.DialogInterface;import android.content.Intent;import android.graphics.Color;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Button;import android.widget.GridView;import android.widget.SimpleAdapter;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private Button button_add;    private GridView gv;     List<Map<String, String>> list = new ArrayList<Map<String, String>>();    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == 1 && resultCode == 1) {            // 获取map集合            final HashMap<String, String> map = (HashMap<String, String>) data                    .getSerializableExtra("map");            // 将map集合添加到list集合中                        list.add(map);            // 为gridview设置适配器            final SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, list,                    R.layout.item, new String[] { "name", "author" },                    new int[] { R.id.item_name, R.id.item_author });            gv.setAdapter(adapter);            // 为gv设置条目点击监听事件            gv.setOnItemClickListener(new OnItemClickListener() {                @Override                public void onItemClick(AdapterView<?> parent, View view,                        final int position, long id) {                gv.setSelector(android.R.color.holo_red_light);                    new AlertDialog.Builder(MainActivity.this)                            .setTitle("确认删除")                            .setMessage("确认删除吗？")                            .setNegativeButton("取消",                                    new DialogInterface.OnClickListener() {                                        @Override                                        public void onClick(                                                DialogInterface dialog,                                                int which) {                                            Toast.makeText(MainActivity.this,                                                    "您放弃了删除", 0).show();                                        }                                    }).setPositiveButton("确认", new DialogInterface.OnClickListener() {                                                                                @Override                                        public void onClick(DialogInterface dialog, int which) {                                                                                         Toast.makeText(MainActivity.this,                                                    "删除成功", 0).show();                                            list.remove(position);                                            adapter.notifyDataSetChanged();                                        }                                    }).show();                }            });        }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 寻找控件        findView();        // 为添加按钮设置点击监听事件        setClick();    }    private void setClick() {        button_add.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                // 回调跳转到添加界面                Intent intent = new Intent(MainActivity.this, AddActivity.class);                startActivityForResult(intent, 1);            }        });    }    private void findView() {        button_add = (Button) findViewById(R.id.button_add);        gv = (GridView) findViewById(R.id.gv);        TextView tv = (TextView) findViewById(R.id.tv_manager);    }}

import java.util.HashMap;import java.util.Map;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.text.TextUtils;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class AddActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_add);                        //找到该布局文件下的控件        final EditText edit_name=(EditText) findViewById(R.id.edit_name);        final EditText edit_author=(EditText) findViewById(R.id.edit_author);        Button button_a=(Button) findViewById(R.id.button_a);                //点击添加按钮实现监听事件        button_a.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View v) {                                 //获取输入框中的信息                 String name = edit_name.getText().toString();                String author = edit_author.getText().toString();                                if(TextUtils.isEmpty(name))                {                    Toast.makeText(AddActivity.this, "图书名字不能为空", 0).show();                    return;                }                if(TextUtils.isEmpty(author))                {                    Toast.makeText(AddActivity.this, "作者不能为空", 0).show();                    return;                }                                //将页面信息封存为map集合                HashMap<String, String> map=new HashMap<String, String>();                map.put("name", name);                map.put("author", author);                                //将map集合存放在intent中并回调到主界面                Intent intent = getIntent();                intent.putExtra("map", map);                setResult(1, intent);                                //将本界面关闭                finish();                                            }        });    } }

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