Activity参数传递

实现两个activity的跳转和参数传递。用intent实现。

第一个activity（MainActivity）：

activity_main.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.exam.exp4_1.MainActivity">    <LinearLayout        android:id="@+id/linearlayout1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >        <EditText            android:id="@+id/username"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="请输入用户名"            android:textSize="20sp"            android:layout_margin="10dp"            android:singleLine="true"/>        <EditText            android:id="@+id/password"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="请输入密码"            android:textSize="20sp"            android:layout_margin="10dp"            android:singleLine="true" />        <EditText            android:id="@+id/birth"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="请输入出生年份"            android:textSize="20sp"            android:layout_margin="10dp"            android:singleLine="true"/>    </LinearLayout>    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_margin="10dp"        android:layout_below="@id/linearlayout1"       >        <Button            android:id="@+id/login"            android:text="@string/login"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textSize="20sp"            android:layout_alignParentLeft="true"            android:layout_marginTop="10dp"            />        <Button            android:id="@+id/register"            android:text="@string/register"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textSize="20sp"            android:layout_alignParentRight="true"            android:layout_marginTop="10dp"            />    </RelativeLayout></LinearLayout>

MainActivity.java:

package com.exam.exp4_1;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import java.util.Calendar;public class MainActivity extends AppCompatActivity {    private Button login;    private Button register;    private EditText username;    private EditText password;    private EditText birth;    private Calendar now;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        login = (Button)findViewById(R.id.login);        register = (Button)findViewById(R.id.register);        username = (EditText)findViewById(R.id.username) ;        password = (EditText)findViewById(R.id.password) ;        birth = (EditText)findViewById(R.id.birth) ;        login.setOnClickListener(new View.OnClickListener(){            public void onClick(View v){                String name = username.getText().toString();                String psd = password.getText().toString();                int birthyear = Integer.parseInt(birth.getText().toString());                now = Calendar.getInstance();//获取现在时间                //将现在时间转换成int类型，减去输入即可                int  nowyear = now.get(Calendar.YEAR) ;                int age = nowyear - birthyear;

                //实现参数传递                Intent it = new Intent(MainActivity.this,B_Activity.class);                Bundle bundle = new Bundle();                bundle.putString("username",name);                bundle.putString("password",psd);                bundle.putInt("birth",age);                it.putExtras(bundle);                startActivity(it);            }        });        register.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent();                intent.setAction("exp2MainActivity");                //intent.addCategory(Intent.Category.DEFAULT);                MainActivity.this.startActivity(intent);            }        });    }}

登录按钮连接的界面（BActivity）：

activity_b.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">    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="10dp"        android:layout_marginTop="10dp">        <TextView            android:id="@+id/username"            android:text="@string/username"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textSize="15sp"            />        <EditText            android:id="@+id/text1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_toRightOf="@id/username"            android:singleLine="true"            android:hint=""            />    </RelativeLayout>    <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="10dp">        <TextView            android:id="@+id/password"            android:text="@string/password"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textSize="15sp"            />        <EditText            android:id="@+id/text2"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_toRightOf="@id/password"            android:singleLine="true"            />    </RelativeLayout>    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="10dp">        <TextView            android:id="@+id/age"            android:text="@string/age"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textSize="15sp"            />        <EditText            android:id="@+id/text3"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:singleLine="true"            android:layout_toRightOf="@id/age"            />    </RelativeLayout></LinearLayout>

BActivity.java:

package com.exam.exp4_1;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.EditText;public class B_Activity extends AppCompatActivity {    private EditText text1;    private EditText text2;    private EditText text3;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_b);        Intent it = getIntent();        Bundle bundle = it.getExtras();        if(bundle != null){            String name = bundle.getString("username");            String psd = bundle.getString("password");            int age = bundle.getInt("birth");            text1 = (EditText)findViewById(R.id.text1);            text1.setText(name+"");            text2 = (EditText)findViewById(R.id.text2);            text2.setText(psd+"");            text3 = (EditText)findViewById(R.id.text3);            text3.setText(age+"");        }    }}

注册按钮连接的界面（前边实现的注册界面）：

在前边实现了的注册信息的activity的AndroidManiFest。xml中设置对一个 action 等属性：

<activity android:name="com.exam.exp2.MainActivity">    <intent-filter>        <action android:name="exp2MainActivity"/>        <action android:name="android.intent.action.MAIN" />        <category android:name="android.intent.category.LAUNCHER" />        <category android:name="android.intent.category.DEFAULT"/>    </intent-filter></activity>

实现效果：