CODEWITHSUNDEEP
androidandroid-studioandroid-fragmentsdependenciesfragment
Yustina Yasin
Yustina Yasin

Reputation: 319

androidx.fragment.app.Fragment cannot be converted to android.app.Fragment

I have a fragment file. There is an error message

"error: incompatible types: androidx.fragment.app.Fragment cannot be converted to android.app.Fragment. fragmentTransaction.replace(R.id.frame_layout, fragment).addToBackStack(null);"

I know there is something wrong with my build.gradle file but i don't know which dependency should i used. I already read the documentation and questions related but some dependency are deprecated. This is my MainActivity file:

package com.example.notesapp;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;

import android.annotation.SuppressLint;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        replaceFragment(HomeFragment.newInstance(), true);
    }

    @SuppressLint("ResourceType")
    public void replaceFragment(Fragment fragment, Boolean istransition){
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        if(istransition) {
            fragmentTransaction.setCustomAnimations(android.R.anim.slide_out_right, android.R.anim.slide_in_left);
        }

        fragmentTransaction.replace(R.id.frame_layout, fragment).addToBackStack(null);
    }
}

And this is my build.gradle file

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.notesapp"
        minSdkVersion 16
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

    //material design
    implementation 'com.google.android.material:material:1.2.1'

    //circle image view
    implementation 'de.hdodenhof:circleimageview:3.1.0'

    //scalable unit text size
    implementation 'com.intuit.ssp:ssp-android:1.0.6'

    //scalable unit size
    implementation 'com.intuit.sdp:sdp-android:1.0.6'

    //room database
    implementation 'androidx.room:room-runtime:2.2.5'
    annotationProcessor 'androidx.room:room-compiler:2.2.5'

    implementation 'com.intuit.ssp:ssp-android:1.0.6'

}

Thanks

Upvotes: 2

Views: 5402

Answers (2)

snachmsm
snachmsm

Reputation: 19253

the question is what is HomeFragment - it extends built-in Fragment or androidx version? it should extend androidx version. and then you have to use getSupportFragmentManager

FragmentManager fragmentManager = getSupportFragmentManager();

then your IDE should suggest you to fix imports or even would do it for you - there shouldn't be used any android.app.Fragment... imports, only androidx.fragment... lines/packages

Upvotes: 1

Vanilil
Vanilil

Reputation: 71

Use

import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction

Instead of

import android.app.FragmentManager;
import android.app.FragmentTransaction;

Upvotes: 4

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