Android(安卓)初体验
16lz
2021-01-25
一年前学过一点点安卓,今天从头再来
首先模拟一个登录界面,写一个线性布局
activity_login.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".LinearLayoutOneActivity" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="帐号:"/> <EditText android:id="@+id/name" android:layout_height="wrap_content" android:layout_width="match_parent" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="密码:"/> <EditText android:id="@+id/passwd" android:layout_height="wrap_content" android:layout_width="match_parent" android:password="true" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <Button android:id="@+id/myFirstBbutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="open baidu" android:onClick="clickButton" /> <Button android:id="@+id/mysecondBbutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="get input" android:onClick="clickButton" /> <Button android:id="@+id/mythirdBbutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="open the windows" android:onClick="clickButton" /> </LinearLayout></LinearLayout>
布局中提供了两个输入框,三个按钮 第一个按钮打开baidu首页,第二个按钮获取输入信息,第三个是打开新窗口
下面是java代码
MainActivity.java
package com.example.rhxy.myapplication;import android.content.Intent;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); } public void clickButton(View v) { int id = v.getId(); if(id==R.id.mysecondBbutton){ //建立对象 EditText name=(EditText) findViewById(R.id.name); EditText passwd=(EditText) findViewById(R.id.passwd); String namecent=name.getText().toString(); String pwdcent=passwd.getText().toString(); Toast.makeText(this,"center:"+namecent+"pwd:"+pwdcent,Toast.LENGTH_SHORT).show(); } if(id==R.id.myFirstBbutton){ Uri uri = Uri.parse("http://www.baidu.com"); Intent it = new Intent(Intent.ACTION_VIEW,uri); startActivity(it); Toast.makeText(this,"第一个按钮",Toast.LENGTH_LONG).show(); } if(id==R.id.mythirdBbutton){ //创建一个窗体对象 /* Intent newWindow = new Intent(); newWindow.setClass(MainActivity.this, scendActivity.class); startActivity(newWindow);*/ //创建一个窗体对象 Intent newWindow = new Intent(); newWindow.setClass(MainActivity.this, scendActivity.class); startActivity(newWindow); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { Toast.makeText(this,"setting",Toast.LENGTH_LONG).show(); return true; } if (id == R.id.action_help) { Toast.makeText(this,"help",Toast.LENGTH_LONG).show(); return true; } return super.onOptionsItemSelected(item); }}
second.java 一时手快,下面拼错了。
package com.example.rhxy.myapplication;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class scendActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_zh); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; }}
值得注意的是,在打开新窗口的时候要在配置文件中,添加 activity
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.rhxy.myapplication" > <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> ***<activity android:name=".scendActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>*** </application></manifest>
ps:Android Studio 确实比eclipse感觉舒服
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