【Java移动媒体实践1】Android简单登录跳转

简单登录和跳转

• • • 1. java
    • • MainActivity.java
      • ArticleListActivity.java
    • 2. xml
    • • login.xml
      • activity_main.xml
      • activity_article_list.xml
    • AndroidManifest.xml

1. java MainActivity.java

package com.empty;

import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private TextView textView;
    private EditText et_number;
    private EditText et_password;
    private Button btn_login;
    private Button btn_chongzhi;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);


        textView = (TextView) findViewById(R.id.textView);
        et_number = (EditText) findViewById(R.id.et_number);
        et_password = (EditText) findViewById(R.id.et_password);
        btn_login = (Button) findViewById(R.id.btn_login);
        btn_chongzhi = (Button) findViewById(R.id.btn_chongzhi);

        btn_login.setOnClickListener(new View.OnClickListener()  {

            @Override
            public void onClick(View v) {
                if (et_number.getText().toString().equals("admin") && et_password.getText().toString().equals("123456")) {
                    //textView.setText("登录成功");
                    Intent intent = new Intent(MainActivity.this,ArticleListActivity.class);

                    Bundle bundle = new Bundle();
                    bundle.putString("name",et_number.getText().toString());
                    bundle.putString("password",et_password.getText().toString());

                    //intent.putExtra("Message","jmptest");
                    intent.putExtra("Message",bundle);
                    startActivity(intent);

                } else {
                    textView.setText("登陆失败，用户名或密码错误!");
                }

            }
        });
        btn_chongzhi.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                et_number.setText("");
                et_password.setText("");
                textView.setText("");

            }
        });
    }
}

ArticleListActivity.java

package com.empty;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import androidx.appcompat.app.AppCompatActivity;

public class ArticleListActivity extends AppCompatActivity {
    ListView lv;
    @Override
    protected  void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_article_list);

        Intent intent = getIntent();
        Bundle bundle = intent.getBundleExtra("Message");
        //Bundle bundle = intent.getExtras();
        String name = bundle.getString("name");
        String password = bundle.getString("password");
        //String message = intent.getStringExtra("Message");

        lv = findViewById(R.id.lv);
        String [] names = {"jmpclass1","jmpclass2","jmpclass3","jmpclass4","jmpclass5"};
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(ArticleListActivity.this, android.R.layout.simple_list_item_single_choice,names);
        lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            }
        });
        lv.setAdapter(adapter);
    }


}

2. xml login.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#E6E6E6"
                android:orientation="vertical">
    <ImageView
            android:id="@+id/iv"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="40dp"
            android:background="@drawable/ic_launcher_foreground"/>
    <LinearLayout
            android:id="@+id/ll_number"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/iv"
            android:layout_centerVertical="true"
            android:layout_marginBottom="5dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="15dp"
            android:background="#ffffff">
        <TextView
                android:id="@+id/tv_number"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="账号："
                android:textColor="#000"
                android:textSize="20sp"/>
        <EditText
                android:id="@+id/et_number"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:background="@null"
                android:padding="10dp"/>
    LinearLayout>
    <LinearLayout
            android:id="@+id/ll_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/ll_number"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:background="#ffffff">
        <TextView
                android:id="@+id/tv_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="密码："
                android:textColor="#000"
                android:textSize="20sp"/>
        <EditText
                android:id="@+id/et_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_toRightOf="@id/tv_password"
                android:background="@null"
                android:inputType="textPassword"
                android:padding="10dp"/>
    LinearLayout>
    <Button
            android:id="@+id/btn_login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/ll_password"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="50dp"
            android:background="#3C8DC4"
            android:text="登录"
            android:textColor="#ffffff"
            android:textSize="20sp"/>
    <Button
            android:id="@+id/btn_chongzhi"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/btn_login"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
            android:background="#3C8DC4"
            android:text="重置"
            android:textColor="#ffffff"
            android:textSize="20sp"/>
    <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="25dp"
            android:textColor="#000"
            android:textSize="20sp"
            android:text=""
            android:layout_below="@+id/btn_chongzhi"
            android:layout_alignLeft="@+id/btn_login"
            android:layout_alignStart="@+id/btn_login"/>
RelativeLayout>

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

androidx.constraintlayout.widget.ConstraintLayout>

activity_article_list.xml

<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".ArticleListActivity">
    <Button android:id="@+id/btnReturn"
            android:layout_width="match_parent"
            android:layout_height="80dp"
            android:text="return"/>
    <ListView android:id="@+id/lv"
              android:layout_width="match_parent"
              android:layout_height="match_parent">ListView>
LinearLayout>

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.empty">
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
            android:usesCleartextTraffic="true"
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/Theme.Empty">
        <activity
                android:name=".ArticleListActivity"
                android:exported="true"/>
        <activity
                android:name=".MainActivity"
                android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            intent-filter>
        activity>
    application>

manifest>