Android 实现页面跳转

android使用Intent来实现页面跳转，Intent通过startActivity(Intent intent)或startActivityForResult(Intent intent,int resquestCode)方法来启动Activity，在新建Intent对象时来指定从A页面跳到B页面，
比如：
Intent i = new Intent(A.this,B.class);这就表示从A页面跳到B页面，
Intent对象通过调用putExtra方法来传递页面跳转时所需要传递的信息
比如：
putExtra（“给需要传递的信息命名”，需要传递的信息的内容）

Intent通过调用getStringExtra方法来接受传递过来的信息
getStringExtra（“传递过来的信息的名字”）；

下面的代码将实现用户输入完信息之后点击登入按钮，页面将跳转到另一页面显示个人信息，然后在这个页面有一个返回按钮，点击返回按钮，页面将返回登入页面再次显示个人信息。

MainActivity.java

package com.example.hsy.register;

import android.content.Intent;
import android.support.annotation.IdRes;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    EditText etName,etPwd;
    Button btnLogin;
    TextView tvShow;
    RadioGroup rg;
    RadioButton rbMale,rbFelMale;
    CheckBox checkbox1,checkbox2,checkbox3;
    Spinner spcity;

    String sex="";
    String hobby1="",hobby2="",hobby3="";
    String result="";
    String city="";


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

        init();

        rglistener();

        btnloginlistener();

        box1listener();

        box2listener();

        box3listener();

        splistener();

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        tvShow.setText("返回结果是："+"\n"+data.getStringExtra("result1").toString()+
                "\n");
    }

    private void splistener() {
        spcity.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                city=(String) spcity.getSelectedItem();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }


    private void box3listener() {
        checkbox3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    hobby3="看书";
                } else {
                    hobby3="";
                }
            }
        });
    }

    private void box2listener() {
        checkbox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    hobby2="游泳";
                } else {
                    hobby2="";
                }
            }
        });
    }

    private void box1listener() {
        checkbox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    hobby1="唱歌";
                } else {
                    hobby1="";
                }
            }
        });
    }

    private void btnloginlistener() {
        btnLogin.setOnClickListener(new View.OnClickListener(){
            @Override

            public void onClick(View v){
                result="用户名是:"+etName.getText().toString()+"\n"+"密码是:"+
                        etPwd.getText().toString()+"\n"+"性别是:"+sex+"\n"+"爱好是："+hobby1+" "
                        +hobby2+" "+hobby3+" "+
                "\n"+"所在城市："+city;
                //tvShow.setText(result);


                Intent i = new Intent(MainActivity.this,Main2Activity.class);
                i.putExtra("data1",result);
                startActivityForResult(i,0);
            }

        });
    }

    private void rglistener() {
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(RadioGroup group, @IdRes int checkedId){
                if(checkedId== R.id.rbMale)
                    sex="男生";
                else
                    sex="女生";

            }
        });
    }

    private void init() {
        etName=(EditText) findViewById(R.id.etName);
        etPwd=(EditText) findViewById(R.id.etPwd);
        btnLogin=(Button) findViewById(R.id.btnLogin);
        tvShow=(TextView) findViewById(R.id.tvShow);
        rg=(RadioGroup) findViewById(R.id.rg);
        rbMale=(RadioButton) findViewById(R.id.rbMale);
        rbFelMale=(RadioButton) findViewById(R.id.rbFeMale);
        checkbox1=(CheckBox) findViewById(R.id.checkbox1);
        checkbox2=(CheckBox) findViewById(R.id.checkbox2);
        checkbox3=(CheckBox) findViewById(R.id.checkbox3);
        spcity=(Spinner) findViewById(R.id.Spcity);

    }
}

MainActivity2.java

package com.example.hsy.register;

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

public class Main2Activity extends AppCompatActivity {

    TextView tvShow;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        tvShow=(TextView)findViewById(R.id.tvShow);
        Intent intent = getIntent();
        tvShow.setText(intent.getStringExtra("data1").toString());

        findViewById(R.id.btnBack).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent1=new Intent(Main2Activity.this,MainActivity.class);
                intent1.putExtra("result1",tvShow.getText().toString());
                setResult(1,intent1);
                finish();
            }
        });
    }
}

test.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">
    <LinearLayout  android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">
        <TextView  android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户名:" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:textSize="20dp" android:textColor="@color/colorPrimaryDark"/>
        <EditText  android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="输入2-10个字符" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:layout_weight="1" android:id="@+id/etName"/>
    </LinearLayout>

    <LinearLayout  android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">
        <TextView  android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="密 码:" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:textSize="20dp" android:textColor="@color/colorPrimaryDark"/>
        <EditText  android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="输入6-10个字符" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:layout_weight="1" android:id="@+id/etPwd"/>
    </LinearLayout>
    <LinearLayout  android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">
        <TextView  android:layout_width="match_parent" android:layout_height="wrap_content" android:text="选择性别:" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" android:textSize="20dp" android:textColor="@color/colorPrimary" />
        <RadioGroup  android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:id="@+id/rg">
            <RadioButton  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="15dp" android:layout_marginTop="10dp" android:textColor="@color/colorAccent" android:textSize="10dp" android:text="男" android:id="@+id/rbMale"/>
            <RadioButton  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="15dp" android:layout_marginTop="10dp" android:textColor="@color/colorAccent" android:textSize="10dp" android:text="女" android:id="@+id/rbFeMale"/>
        </RadioGroup>
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content">
        <TextView  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:textSize="20dp" android:textColor="@color/colorAccent" android:text="兴趣爱好:"/>
        <CheckBox  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:textSize="15dp" android:textColor="@color/colorAccent" android:id="@+id/checkbox1" android:text="唱歌"/>
        <CheckBox  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:textSize="15dp" android:textColor="@color/colorAccent" android:id="@+id/checkbox2" android:text="游泳"/>
        <CheckBox  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:textSize="15dp" android:textColor="@color/colorAccent" android:id="@+id/checkbox3" android:text="看书"/>
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content">
        <TextView  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_marginTop="6dp" android:textSize="15dp" android:text="所在地"/>
        <Spinner  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="6dp" android:layout_marginLeft="10dp" android:entries="@array/citys" android:id="@+id/Spcity">

        </Spinner>
    </LinearLayout>



    <Button  android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登录" android:layout_marginTop="10dp" android:textSize="20dp" android:id="@+id/btnLogin"/>

    <TextView  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="显示信息" android:id="@+id/tvShow"/>


</LinearLayout>

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.hsy.register.Main2Activity">
    <TextView  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" android:text="显示结果" android:id="@+id/tvShow"/>

    <Button  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:text="返回结果" android:id="@+id/btnBack"/>


</LinearLayout>