android基本操作 _android

丈夫志四海，万里犹比邻。这篇文章主要讲述android基本操作相关的知识，希望能为你提供帮助。
1.页面跳转
activity_main.xml

< ?xml version="1.0" encoding="utf-8"?> < androidx.constraintlayout.widget.ConstraintLayout 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" tools:context=".MainActivity"> < TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="160dp" android:layout_marginLeft="160dp" android:layout_marginTop="268dp" android:layout_marginBottom="64dp" android:text="第一个界面" app:layout_constraintBottom_toTopOf="@+id/button" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> < Button android:id="@+id/button" android:layout_width="wrap_content" android:layout

< ?xml version="1.0" encoding="utf-8"?> < androidx.constraintlayout.widget.ConstraintLayout 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" tools:context=".Main2Activity"> < Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="160dp" android:layout_marginLeft="160dp" android:layout_marginBottom="308dp" android:text="结束" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" /> < TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="176dp" android:layout_marginLeft="176dp" android:layout_marginTop="268dp" android:layout_marginBottom="88dp" android:text="第二个界面" app:layout_constraintBottom_toTopOf="@+id/button2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> < /androidx.constraintlayout.widget.ConstraintLayout>

_height="wrap_content" android:layout_marginStart="148dp" android:layout_marginLeft="148dp" android:layout_marginBottom="340dp" android:text="跳转" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" /> < /androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.activityjieshao; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button=(Button)findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(MainActivity.this,Main2Activity.class); startActivity(intent); } }); } }

activity_main2.xml

< ?xml version="1.0" encoding="utf-8"?> < androidx.constraintlayout.widget.ConstraintLayout 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" tools:context=".Main2Activity"> < Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="160dp" android:layout_marginLeft="160dp" android:layout_marginBottom="308dp" android:text="结束" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" /> < TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="176dp" android:layout_marginLeft="176dp" android:layout_marginTop="268dp" android:layout_marginBottom="88dp" android:text="界面二" app:layout_constraintBottom_toTopOf="@+id/button2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> < /androidx.constraintlayout.widget.ConstraintLayout>

MainActivity2.java

package com.example.activityjieshao; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class Main2Activity extends AppCompatActivity { private Button butten2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); butten2=(Button)findViewById(R.id.button2); butten2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); } }

【android基本操作】