Activity参数传递

最新推荐文章于 2020-09-12 17:44:06 发布

原创最新推荐文章于 2020-09-12 17:44:06 发布 · 573 阅读

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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：