页面跳转Sample

案例演示了Intent之间的数据传递, 其中包含三个Activity:

• MainActivity
  • 按钮1, 从ContactActivity中获取电话号码数据,结束并返回和显示数据
  • 按钮2, 从SmsTemplateActivity中获取文本数据,结束并返回和显示数据
• ContactActivity
  • 一个ListView,其中包含电话号码数据
• SmsTemplateActivity
  • 一个ListView,其中包含短信数据

使用方法:

• startActivityForResult()
• 重写onActivityResult()
• setResult(requestCode, Intent)

布局文件

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.goldinfo.mymsgsender.MainActivity">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <EditText
            android:id="@+id/et_number"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入发送的号码" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignBottom="@+id/et_number"
            android:onClick="add"
            android:text="+" />

    </RelativeLayout>


    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:gravity="top"
        android:hint="请输入短信的内容" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="插入模板"
        android:onClick="insert"
        />
    
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="发送"
        android:onClick="send"
        />
</LinearLayout>  

activity_contact.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </ListView>

</LinearLayout>

contact_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="#109384"
        android:text="SunShine" />

    <TextView
        android:id="@+id/tv_number"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="#990090"
        android:text="111"
        android:textSize="20sp" />

</LinearLayout>

activity_smstemplate.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lv"></ListView>
</LinearLayout>

template_item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:textColor="#990011"
    />

MainActivity.java

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private EditText et_number;
    private EditText et_content;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        //找到控件
        et_number = (EditText) findViewById(R.id.et_number);
        et_content = (EditText) findViewById(R.id.et_content);


    }


    //点击按钮跳转到ContactActivity页面
    public void add(View v) {

        //创建意图对象
        Intent intent = new Intent(this, ContactActivity.class);
        //当我们开启一个Activity, 我需要这个新的Activity的数据, 应该使用下面这个方法启动
        startActivityForResult(intent, 10);
    }

    //点击按钮跳转到短信模板页面
    public void insert(View v) {
        Intent intent = new Intent(this, SmsTemplateActivity.class);
        startActivityForResult(intent, 20);
    }

    //这个方法当startActivityForResult开启的Activity的页面关闭的时候就调用这个方法

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == 10) {
            //说明结果数据来源于 联系人页面

            //参数data就是ContactActivity传递过来的意图对象
            String number = data.getStringExtra("number");

            //把phone设置到EditText上
            et_number.setText(number);
        } else if (resultCode == 20) {
            //说明结果数据来源于模板

            String smsContent = data.getStringExtra("smscontent");
            et_content.setText(smsContent);

        }

    }
}

Contact.java

public class Contact {



    private String name;

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    private String number;
}

ContactActivity.java

public class ContactActivity extends AppCompatActivity {

    private ListView lv;
    private List<Contact> lists;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //加载布局
        setContentView(R.layout.activity_contact);
        //找到ListView控件
        lv = (ListView) findViewById(R.id.lv);
        //准备ListView要显示的数据
        lists = new ArrayList<Contact>();

        for(int i=0; i<20; i++){
            Contact contact = new Contact();
            contact.setName("Sun"+i);
            contact.setNumber("01888"+i);
            lists.add(contact);
        }

        lv.setAdapter(new MyAdapter());

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //取出点中条目的电话号码, 数据在哪里存就去哪里取
                String number = lists.get(position).getNumber();

                //把电话号码number返回给MainActivity
                Intent intent = new Intent();
                intent.putExtra("number", number);

                //把我要传递的数据传递回给MainActivity
                setResult(10, intent);
                finish();
            }
        });

    }

    private class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return lists.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view;
            if(convertView == null){
                //历史缓存对象为空
                view = View.inflate(getApplicationContext(), R.layout.contact_item, null);
            }else{
                view = convertView;
            }

            //找到contact_item 这个布局里面的控件 用来显示数据
            TextView tv_name = (TextView) view.findViewById(R.id.tv_name);
            TextView tv_number = (TextView) view.findViewById(R.id.tv_number);

            //显示数据
            tv_name.setText(lists.get(position).getName());
            tv_number.setText(lists.get(position).getNumber());

            return view;
        }
    }
}

SmsTemplate.java

public class SmsTemplateActivity extends AppCompatActivity {

    private ListView lv;

    String[] greetings = {"Good Morning!", "Good Afternoon!", "Hello!", "你好!", "Good Night!", "Good Evening!",
                                "Bonjour!"};

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_smstemplate);

        //找到控件listView
        lv = (ListView) findViewById(R.id.lv);

        //数据适配器
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.template_item, greetings);

        //显示数据
        lv.setAdapter(adapter);

        //设置点击事件
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //获取点击条目的数据
                String smsContent = greetings[position];
                //创建意图
                Intent intent = new Intent();
                intent.putExtra("smscontent", smsContent);
                //把数据返回给调用者
                setResult(20, intent);
                //把当前页面关闭
                finish();


            }
        });
    }
}