Render problem Failed to find style 'coordinatorLayoutStyle' in current theme Missing styles. Is the correct theme chosen for this layout? failed to instantitte one or more classes

Render problem Failed to find style 'coordinatorLayoutStyle' in current theme Missing styles. Is the correct theme chosen for this layout? failed to instantiate one or more classes

achange sdk 28 to 27 and go to Tools >> sdk manager and download API LEVEL 27

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.raj.test"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    implementation 'com.android.support:design:27.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

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ConstraintLayout problem solution AUGUST 2018

change sdk 28 to 27 and go to Tools >> sdk manager and download API LEVEL 27

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.raj.test"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    implementation 'com.android.support:design:27.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

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adb.exe,start-server' failed — run manually if necessary, Android Studio

'C:\Users\viraj\AppData\Local\Android\sdk\platform-tools\adb.exe,start-server' failed -- run manually if necessary



Solution

1. stopped genymotion emulator.
2. Then  restart ADB (Tools > Android > Unchecked Unable ADB Integration then  checked again)
3. Next  start genymotion emulator again And now the app works on the emulator.

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Failed to load AppCompat ActionBar with unknown error?

I had the same problem. Seems it is a Android Studio bug.

In your styles xml-file change this:

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

to this:

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

Works for me.

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unable-to-resolve-dependency error solution

just go to Settings >Gradle >Disable Offline Work 

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Render problem Failed to load AppCompat ActionBar with unknown error.

REPLACE 3 WITH 1 

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raw file creation

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Tips to speed Up Android Studio

• Update Android Studio(2.3) and Java To the latest One
• Disable unwanted Plugins. Demo Video
• If you are not using VCS and Google Cloud Services then disable the following Plugins:

GitIntegration, GitHub, CVS Integration, Google Login and its dependent Plugins, Subversion Integration.

• Close All Windows and Browser While Using Android Studio.
• Avoid Built in Emulators. Try GenyMotion or Real Devices(Recommended)
• Disable Unwanted Startup Programs. Check the help here
• Tweak the Gradle to reduce Build Time
• Update Your RAM to 8GB (atleast 4GB)

Hope its helpful..!! Happy Androidify...!!!!

video link 

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arti type app new line solution

<resources>
    <string name="app_name">Del</string>
    <string name="hindi">

        <html> जय देव, जय देव, जय शिव मार्तंडा…\n
हरी मदन मल्हारी तूची प्रचंडा…जय देव !\n
\n
जेजुरगड पर्वत शिवलिंगाकार, मृत्युलोकी दुसरे कैलास शिखर,\n
नाना परि ती रचना रचली अपार,\n
त्रयेस्थळी नांदे स्वामी शंकर....जय देव !\n
जय देव, जय देव, जय शिव मार्तंडा…\n
हरी मदन मल्हारी तूची प्रचंडा…जय देव !\n
\n
मणि-मल्ल दैत्य प्रबळ तो झाला,\n
देव-गण-गंधर्व कापति त्याला,\n
हाती तलवार, खडग, त्रिशूळ, भाला,\n
आदि शक्ती म्हाळसा घेउन संगतिला....जय देव !\n
जय देव, जय देव, जय शिव मार्तंडा…\n
हरी मदन मल्हारी तूची प्रचंडा…जय देव !\n
\n
चंपा शष्ठी दिवशी अवतार धरिशी,\n
मणि-मल्ल दैत्यांचा संहार करीशी,\n
चरणी पृष्टि वरति खडग़ स्थापिशी,\n
अंति वर देउनी त्यास मुक्ति दे देशी.....जय देव !\n
जय देव, जय देव, जय शिव मार्तंडा…\n
हरी मदन मल्हारी तूची प्रचंडा…जय देव !\n
\n
मणि-मल्ल दैत्य मर्दुनी मल्हारी,\n
देवा संकट पडता राहे जेजूरी,\n
अर्धांगी म्हाळसा शोभे सुंदरी,\n
देवा ठाव मागे दास नरहरि....जय देव !\n
जय देव, जय देव, जय शिव मार्तंडा…\n
हरी मदन मल्हारी तूची प्रचंडा…जय देव !\n</html>
    </string>
</resources>

or plz check

TextView txtSubTitle = (TextView)findViewById(r.id.txtSubTitle);
txtSubTitle.setText(Html.fromHtml(getResources().getString(R.string.sample_string)));

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Radio Button direct Click

package com.example.viraj.radiobuton;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private RadioGroup radioGroup;
    private RadioButton radioButton;
   

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        radioGroup = (RadioGroup) findViewById(R.id.id_radioGroup);
       
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                radioButton = (RadioButton) findViewById(i);

                switch (radioButton.getId()) {
                    case R.id.id_yes: {
                        if (radioButton.isChecked()) {
                            Toast.makeText(getApplicationContext(), "YES I AM COMING", Toast.LENGTH_LONG).show();
                        }

                    }
                    break;
                    case R.id.id_no: {
                        if (radioButton.isChecked()) ;
                        {
                            Toast.makeText(getApplicationContext(), "NO I AM NOT COMING", Toast.LENGTH_LONG).show();
                        }
                    }
                    break;
                    case R.id.id_maybe: {
                        if (radioButton.isChecked()) ;
                        {
                            Toast.makeText(getApplicationContext(), "MAY BE COMING", Toast.LENGTH_LONG).show();
                        }
                    }
                    break;
                }
            }
        });


    }
}

xml file

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.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"

    android:background="@drawable/one"

    tools:context="com.example.viraj.radiobuton.MainActivity">

    <RadioGroup

        android:id="@+id/id_radioGroup"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginEnd="8dp"

        android:layout_marginStart="8dp"

        android:layout_marginTop="52dp"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/textView">

        <RadioButton

            android:id="@+id/id_yes"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="YES" />

        <RadioButton

            android:id="@+id/id_no"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="NO" />

        <RadioButton

            android:id="@+id/id_maybe"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="MAY BE" />

    </RadioGroup>

    <TextView

        android:id="@+id/textView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginEnd="8dp"

        android:layout_marginStart="8dp"

        android:layout_marginTop="76dp"

        android:text="ARE YOU COMING ...."

        android:textColor="@color/colorPrimaryDark"

        android:textSize="24sp"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.503"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

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colour converter app

package com.gohool.trymeoriginal.trymeoriginal;


import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.example.viraj.trymecolourconverter.R;

import java.util.Random;


public class MainActivity extends AppCompatActivity {

    private View windowView;
    private Button tryMeButton;
    private int[] colors;


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

        colors = new int[]{Color.CYAN, Color.GREEN, Color.RED, Color.BLUE, Color.BLACK, Color.DKGRAY,
                Color.LTGRAY, Color.MAGENTA, Color.YELLOW};

        windowView = findViewById(R.id.windowViewId);



        tryMeButton = (Button) findViewById(R.id.tryMeButton);
        tryMeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //Array length
                int colorArrayLength = colors.length;

                Random random = new Random();
                int randomNum = random.nextInt(colorArrayLength);

                windowView.setBackgroundColor(colors[randomNum]);

                Log.d("Random", String.valueOf(randomNum));
            }
        });







    }
}

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localhost with android not working solution

1. run you wamp server => click right mouse button => and click on "put online"
2. then open your cmd as an administrateur , and pass in this commande word
3. then lot of adresses show-up , then you have just to take the first one , it's look like this example: Adresse IPv4. . . . . . . . . . . . . .: 192.168.67.190 well done ! , that's the addresse, that you will use to connecte to your wampserver in local.
4. open Control Panel >> System and Security >> Windows Firewall
5. then go to control panel > system and security > windows firewall and turn windows firewall off
6. now String reg_url = "http://192.168.00.0/udemy/register.php";

"""   past ur address  >>>>>>    192.168.00.0  """

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