Import error in android studio design and v7 - Android Studio -

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I am new to java and Android studio, but I tried to create an app

Here is the code -

MainActivity.java

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import androidx.appcompat.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

In this code, the design word shows - cannot resolve symbol 'design'

and, the v7 word shows - cannot resolve symbol 'v7'

build.gradle(Module:app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"
    defaultConfig {
        applicationId "com.example.pop"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.material:material:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

}

If, I ran this program which shows compiler error

error: package android.support.design.widget does not exist
error: package android.support.design.widget does not exist
error: package android.support.v7.widget does not exist

How to resolve this error, thanks

If you are using androidx implementations, you should use

import androidx.appcompat.widget.Toolbar;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.floatingactionbutton.FloatingActionButton;

But if you want to run with your imports, compile this dependencies in your build.gradle:

dependencies {
   ...
   implementation 'com.android.support:design:25.3.1'
}

Support Library Setup, We no longer support downloading the libraries through the SDK Manager, you explicitly specify a library version (for example, palette-v7:28.0.0 ). using classes from the Support Library, be certain you import the class from Developer guides � Design guides � API reference � Samples � Android Studio. android\support\appcompat-v7\24.2.1\appcompat-v7-24.2.1.aar This file can be imported by right-click project, import, select general, select archieve and finally select aar file. Even this does not solve the problem. Later remove ‘import android.R’ and add ‘import android.support.v7.appcompat.*;’ Follow this tutorial for other details:

Migrate to Android Studio, For example the RecyclerView class provides an user interface widget an explicit SDK version check and provide alternative code to handle methods For example, the support-v4 and the support-v7 package both support a Developer guides � Design guides � API reference � Samples � Android Studio. The import android.support.v7.app cannot be resolved error solution. 1.Select your project by clicking on project name. Then press ” ALT + ENTER ” to open project properties. 2. Click on Java Build Path. 3. Then click on Libraries > Add external JARs . 4. Now navigate your android sdk installation folder and goto SdkManager\extras\android\support\v7\appcompat\libs and select android-support-v7-appcompat jar file.

It seems like you have migrated to AndroidX. Remove those three imports

import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.widget.Toolbar;

and add this

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import androidx.appcompat.widget.Toolbar;

Support Library, The Gradle build system in Android Studio makes it easy to include external binaries or As of Android Gradle Plugin 4.0, native dependencies can also be imported in the To resolve this error, add annotation processors to your project by configuring your implementation 'com.android.support:appcompat-v7:28.0.0' I'm trying to figure out why the heck my Android studio isn't recognizing the AppCompat v7 library correctly. The import statement below shows up as gray and says there's no package for support.v7.app. Below is my activity file:

You use androidx which is part of android jetpack So that it's not support support design import You can solve this problem simply just change the import to

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import androidx.appcompat.widget.Toolbar;

Hope it's work nicely. Also you can learn about jetpack androidx from here

Add build dependencies, setLocalNightMode has been marked as requiring SDK version 17 or higher on AppCompatActivity that takes an R.layout ID, indicating the layout that should be Fixed fontFamily not working on pre API 24 (aosp/807054); Fixed bug where� Fix Appcompat import and errors (eclipse and android studio) quikly - Duration: 4:32. The import android.support.v7 cannot be resolved & ActionBarActivity cannot be resolved to a type

This will cause for you have use androidx For development so design library is deprecated use..

implementation 'com.google.android.material:material:1.2.0-alpha04'

this material library created by google for all View and widgets.. hope it will help you..

Appcompat, The Gradle build system in Android Studio makes it easy to include external binaries or other library modules to your build as dependencies. The dependencies can be located on your machine or in a remote repository, and any transitive dependencies they declare are automatically included as well.

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With Android Studio 3.2 and higher, you can migrate an existing project to AndroidX by selecting Refactor > Migrate to AndroidX from the menu bar. The refactor command makes use of two flags. By default, both of them are set to true in your gradle.properties file: android.useAndroidX=true The Android plugin uses the appropriate AndroidX library