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先在strings.xml声明变量
方法1.
方法2.
1.单位dp,大家可以去学一下有关的单位换算
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1.
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4.设置文本背景颜色
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2.
与上级视图一致,也就是上一级有多宽就有多少
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- <?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"
- tools:context=".MainActivity">
- <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:background="@color/blue"
- android:layout_margin="50sp"
- android:padding="50dp"
- tools:context=".MainActivity">
-
- <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:background="@color/red"
- android:layout_margin="50sp"
- tools:context=".MainActivity">
- </LinearLayout>
- </LinearLayout>
- <TextView
- android:id="@+id/tv"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- android:textSize="40dp"
- android:background="@color/red"
- app:layout_constraintBottom_toBottomOf="parent"
- app:layout_constraintEnd_toEndOf="parent"
- app:layout_constraintStart_toStartOf="parent"
- app:layout_constraintTop_toTopOf="parent" />
-
- <!-- <Button
- android:id="@+id/button1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="跳转1"
- app:layout_constraintBottom_toTopOf="@id/button2"
- app:layout_constraintEnd_toEndOf="parent"
- app:layout_constraintHorizontal_bias="0.501"
- app:layout_constraintStart_toStartOf="parent"
- app:layout_constraintTop_toBottomOf="@id/tv" />
-
- <Button
- android:id="@+id/button2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="跳转2"
- app:layout_constraintTop_toBottomOf="@id/button1"
- app:layout_constraintStart_toStartOf="parent"
- app:layout_constraintEnd_toEndOf="parent"
- app:layout_constraintBottom_toBottomOf="parent"
- />-->
-
-
- </LinearLayout>

- <?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=".MainActivity">
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:background="@color/blue"
- android:layout_weight="1"
- android:orientation="horizontal"
- tools:context=".MainActivity"
-
- >
- <TextView
- android:id="@+id/tv1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- android:textSize="30dp"
- android:background="@color/white"
-
- <TextView
- android:id="@+id/tv2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- android:textSize="30dp"
- android:background="@color/red"
-
- </LinearLayout>
- <LinearLayout
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:background="@color/pink"
- android:orientation="vertical"
- tools:context=".MainActivity"
- android:layout_weight="1"
- >
- <TextView
- android:id="@+id/tv1"
- android:layout_width="wrap_content"
-
- android:layout_height="wrap_content"
- android:text="@string/hello"
- android:textSize="30dp"
- android:background="@color/green"
-
- <TextView
- android:id="@+id/tv2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- android:textSize="30dp"
- android:background="@color/red"
-
-
- </LinearLayout>
-
-
- <!-- <Button
- android:id="@+id/button1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="跳转1"
- app:layout_constraintBottom_toTopOf="@id/button2"
- app:layout_constraintEnd_toEndOf="parent"
- app:layout_constraintHorizontal_bias="0.501"
- app:layout_constraintStart_toStartOf="parent"
- app:layout_constraintTop_toBottomOf="@id/tv" />
-
- <Button
- android:id="@+id/button2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="跳转2"
- app:layout_constraintTop_toBottomOf="@id/button1"
- app:layout_constraintStart_toStartOf="parent"
- app:layout_constraintEnd_toEndOf="parent"
- app:layout_constraintBottom_toBottomOf="parent"
- />-->
-
-
- </LinearLayout>

- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout 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/tv1"
- android:layout_width="wrap_content"
- android:layout_centerHorizontal="true"
- android:layout_centerVertical="true"
- android:layout_height="wrap_content"
- android:text="中心"
- android:textSize="40dp"
- android:background="@color/green"/>
-
- <TextView
- android:id="@+id/tv2"
- android:layout_width="wrap_content"
- android:layout_centerHorizontal="true"
- android:layout_alignParentTop="true"
- android:layout_height="wrap_content"
- android:text="中心正上方"
- android:textSize="40dp"
- android:background="@color/green"/>
- <TextView
- android:id="@+id/tv3"
- android:layout_width="wrap_content"
- android:layout_centerVertical="true"
- android:layout_alignParentRight="true"
- android:layout_height="wrap_content"
- android:text="右方"
- android:textSize="40dp"
- android:background="@color/green"/>
- <TextView
- android:id="@+id/tv4"
- android:layout_width="wrap_content"
- android:layout_alignRight="@id/tv3"
- android:layout_height="wrap_content"
- android:text="1"
- android:textSize="40dp"
- android:background="@color/green"/>
-
-
- </RelativeLayout>

- <?xml version="1.0" encoding="utf-8"?>
- <GridLayout 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:columnCount="2"
- android:rowCount="2"
- tools:context=".MainActivity">
-
-
- <TextView
- android:id="@+id/tv4"
- android:layout_width="wrap_content"
- android:layout_columnWeight="1"
- android:layout_height="60dp"
- android:text="1"
- android:textSize="40dp"
- android:gravity="center"
- android:background="@color/green"/>
- <TextView
- android:id="@+id/tv3"
- android:layout_width="wrap_content"
- android:layout_columnWeight="1"
- android:layout_height="60dp"
- android:text="2"
- android:gravity="center"
- android:textSize="40dp"
- android:background="@color/green"/>
- <TextView
- android:id="@+id/tv2"
- android:layout_columnWeight="1"
- android:layout_height="60dp"
- android:text="3"
- android:gravity="center"
- android:textSize="40dp"
- android:background="@color/green"/>
- <TextView
- android:id="@+id/tv1"
- android:layout_columnWeight="1"
- android:layout_height="60dp"
- android:text="4"
- android:gravity="center"
- android:textSize="40dp"
- android:background="@color/green"/>
-
- </GridLayout>

- <?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">
-
- <HorizontalScrollView
- android:layout_width="wrap_content"
- android:layout_height="200dp">
-
- <LinearLayout
- android:layout_width="wrap_content"
- android:layout_height="match_parent"
- android:orientation="horizontal">
-
- <View
- android:layout_width="300dp"
- android:layout_height="300dp"
- android:background="@color/green"/>
-
- <View
- android:layout_width="300dp"
- android:layout_height="300dp"
- android:background="@color/blue" />
- </LinearLayout>
- </HorizontalScrollView>
-
- </LinearLayout>

activity xml代码
- package com.example.test2;
-
- import androidx.appcompat.app.AppCompatActivity;
-
- import android.os.Bundle;
- import android.os.ParcelUuid;
- import android.view.View;
- import android.widget.Button;
- import android.widget.TextView;
-
- public class ButtonClickActivity extends AppCompatActivity {
-
- private TextView tv_result;
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_button_click);
- // 找到指定的按钮
- tv_result = findViewById(R.id.tv_result);
- Button buttonclick1 = findViewById(R.id.buttonclick1);
- buttonclick1.setOnClickListener(new MyOnClickListener(tv_result));
- }
-
- static class MyOnClickListener implements View.OnClickListener {
-
- private final TextView tv_result;
-
- public MyOnClickListener(TextView tv_result) {
- this.tv_result = tv_result;
- }
-
- @Override
- public void onClick(View v) {
-
- String desc = String.format("%s 你点击的按钮是: %s", DateUtil.getNowTime(), ((Button)v).getText());
- tv_result.setText(desc);
- }
- }
- }

button click java代码
- <?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"
- tools:context=".ButtonClickActivity"
- android:orientation="vertical">
-
- <Button
- android:id="@+id/buttonclick1"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="指定单独的点击监听器"
- android:textColor="@color/black"
- android:textSize="15sp"
- />
-
- <TextView
- android:id="@+id/tv_result"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:padding="5dp"
- android:gravity="center"
- android:textColor="@color/black"
- android:textSize="15dp"
- android:text="点击查看结果"
- />
-
- </LinearLayout>

DateUtil代码
- package com.example.test2;
-
- import java.text.SimpleDateFormat;
- import java.util.Date;
-
- public class DateUtil {
- public static String getNowTime()
- {
- SimpleDateFormat sdf=new SimpleDateFormat("HH:mm:ss");
- return sdf.format(new Date());
-
-
- }
- }
Androidmainifest代码
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools">
-
- <application
- android:allowBackup="true"
- android:dataExtractionRules="@xml/data_extraction_rules"
- android:fullBackupContent="@xml/backup_rules"
- android:icon="@mipmap/ic_launcher"
- android:label="@string/app_name"
- android:roundIcon="@mipmap/ic_launcher_round"
- android:supportsRtl="true"
- android:theme="@style/Theme.Test2"
- tools:targetApi="31">
-
- <activity
- android:name=".MainActivity3"
- android:exported="false" />
- <activity
- android:name=".ButtonClickActivity"
- android:exported="true">
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
-
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
- <activity android:name=".MainActivity2" />
-
- </application>
-
- </manifest>

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