Android Development Posts

Snackbars are fairly common in the Android app. Almost every app uses a snack bar to display some information about what's going on in the app. You can consider Snackbar as an alternative or the best version of Toasts in Android.

Step 1: Using a normal Snackbar

To use Snackbar in your app, you just have to have the material design dependency in your app. Add Material design dependency to your build.Gradle app-level.

dependencies {
    implementation "com.google.android.material:$latest_version"
}

And then you can use the snack bar just like toast. For example:

Snackbar.make(view, "Show some message here", Snackbar.LENGTH_SHORT).show()

Step 2: Working with the MainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:id="@+id/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.application.snackbarapp.MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:text="show snackbar" />

    </RelativeLayout>

</android.support.design.widget.CoordinatorLayout>

Step 3: Creating a custom layout for a snack bar

Under Layout, the folder creates a layout for the snack bar that must be inflated when creating a snack bar under the mainactivity.java file.

import android.graphics.Color;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private CoordinatorLayout coordinatorLayout;
    private Button button;

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

        coordinatorLayout = findViewById(R.id.coordinatorLayout);
        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showSnackbar();
            }
        });
    }

    public void showSnackbar() {
        Snackbar snackbar = Snackbar.make(coordinatorLayout, "Marked as Read", Snackbar.LENGTH_INDEFINITE)
                .setAction("UNDO", new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Snackbar snackbar1 = Snackbar.make(coordinatorLayout, "Undo successful", Snackbar.LENGTH_SHORT);
                        snackbar1.show();
                    }
                })
                .setActionTextColor(Color.RED);

        snackbar.show();
    }
}

While developing apps in Android Studio, developers can create an APK file and share it with other developers or to QA people for testing purposes.

APK can be created with two types:

1. Debug APK
2. Release APK

• Debug APK is very fast in building and Release APK is a little bit slow.

How to create a Release APK File:

• Flowing below all steps
• Open android studio
• Click Build on the toolbar
• Click Generate Signed Bundle/APK.
• Select APK
• Click the Next button
• After clicking the next button, you will see the following dialog.
• Click the "Create new..." button, highlighted in the following image by a red circle if you are creating an APK for the first time. Otherwise, you can choose from existing.
• It will open one another dialog box
• Key store path in select save location .jks file
• Fill in all the information
• Set a valid name for the key alias
• Set 100 as validity years
• Fill Certificate Information
• Click OK
• After you click on it, select "release" from the dialog box
• Select "V1 (Jar Signature)" & "V2 (Full APK Signature)" checkboxes
• Click Finish
• It will start the process of building your APK

How to create a debug .apk file

• Click Build and select Build Bundles(s)/APK(s)
• Select "Build APK(s)" from the dialog box
• It will start the process of building your debug APK file creating

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Search Keys:

• Shift+Shift — Search Everywhere
• Ctrl+F — Find Text within a Single File
• Ctrl+Shift+F-Find Text in All Files
• Ctrl+R — Replace Selected Text in a Single File
• Ctrl+Shift+R — Replace Selected Text in all Files (Be Careful while Using This)
• Ctrl+Shift+A —Search for IDE Commands

Navigation Keys:

• Ctrl+N — Navigate to Class
• Ctrl+Shift+N — Navigate to a File
• Ctrl+B — Jump to Declarations
• Alt+ ↑ — Jump to the Previous Method
• Alt+↓ — Jump to Next Method
• Ctrl+G — Jump to Line
• Ctrl+E — Recent Files
• Ctrl+Shift+Backspace — Jump to Last Edited Location
• Ctrl+B — Find Declarations
• Ctrl+Left Mouse(or)Ctrl+Alt+F7— Show Usage
• Alt + F7 / Ctrl + F7 — Find usages /Find usages in file
• Ctrl+Shift+B — Find Implementations
• F3 — Find Next
• Shift+F3 — Find Previous

BookMark Keys:

• F11 — Toggle bookmark
• Ctrl+F11 — Toggle bookmark with the mnemonic(0–9 or A-Z)
• Ctrl +(0–9) — Go to numbered bookmark
• Shift+F11 — Show all Bookmarks
• Ctrl + Shift + F7 — Highlight usages in file

Selection Keys:

• Ctrl + W — Extend selection (selects a word->line->method->Class )
• Ctrl +Shift+ W — Decrease Selection
• Alt + J — Select next occurrence
• Ctrl + Alt + Shift + J — Select all occurrences
• Alt + Shift + J — Unselect occurrence
• Ctrl+Shift+V — Paste from recent buffers (from a History of Copied Contents)

Editing Keys:

• Ctrl+F6 — Refactor Code
• Ctrl+D — Duplicate a Line/Selected part
• Ctrl+Y — Delete a Line/Selected part
• Ctrl+Q — Quick Documentation
• Ctrl + Space — Code completion
• Ctrl+Shift+Space — Smart code completion (by expected type removes unrelated suggestions)
• Alt+Insert — Generate Code
• Ctrl+J — Insert Live template
• Ctrl + O — Override methods
• Ctrl + I — Implement methods
• Ctrl + Alt + T — Surround with…
• Ctrl + / — Comment / uncomment with line comment
• Ctrl + Shift + / — Comment / uncomment with block comment
• Ctrl+Alt+L — Reformat code

Run:

• Ctrl + F9 — Compile and Run Make a project
• Ctrl + Shift + F9 — Compile selected file, package or module
• Shift + F10 — Run
• Shift + F9 — Debug
• Ctrl + Shift + F10 — Run context configuration from editor

Debugging:

• F8 / F7 — Step over / into
• Shift + F7 / Shift + F8 — Smart step into/Step out
• Alt + F9 — Run to cursor
• Alt + F8 — Evaluate expression
• F9 — Resume program
• Ctrl + F8 — Toggle breakpoint
• Ctrl + Shift + F8 — View breakpoints

What is a SplashScreen?

A splash screen is a screen that appears when you open an app on your mobile device. So, we can say that it is the first impression for the user. It is commonly used to show an application logo or an image associated with an application.

Implementation

So instead of using a layout file, we'll refer to the splash screen as the background of the activity theme. first, create an XML drawable splash_background.xml inside the res/drawable folder in

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

   <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
   <item android:drawable="@color/white" />
   <item android:drawable="@drawable/ic_icon_vector" android:gravity="center" />

</layer-list>

next step, set splash_groundground.xml as the background for your splash activity in the theme. Add a new splash to your splash activity.

<!-- Splash Screen theme. -->
<style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
<item name="android:windowBackground">@drawable/splash_background></item>
</style>

Add your theme to AndroidManifest.xml as your splash activity theme.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.exmple.splash">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme">

        <activity
            android:name=".SplashActivity"
            android:theme="@style/SplashTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest></pre><div>
}

Create a blank activity for SplashActivity.java without XML. This class will only redirect to MainActivity.java.

public class SplashActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        startActivity(new Intent(SplashActivity.this, MainActivity.class));
        finish();
    }
}

dependencies {     
implementation
‘androidx.cardview:cardview:1.0.0’
}

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android">

background2.xml

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android">

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android">

Now create a card view in the main XML file. Here I used LinearLayout as the root widget, after using the card view. Below the codes that give you an idea of how to customize the card.
You can change it according to your needs.

<?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">
    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="173dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="20dp"
        app:cardCornerRadius="8dp">

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/bg1"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="30dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="30dp"
                android:orientation="horizontal">

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Assam"
                        android:textColor="#000000"
                        android:textSize="22sp" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Current Location"
                        android:textColor="#000000"
                        android:textSize="14sp" />
                </LinearLayout>

            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginStart="30dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="30dp"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="25"
                    android:textColor="#000000"
                    android:textSize="28sp" />

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="6dp"
                        android:text="o"
                        android:textColor="#000000"
                        android:textSize="13sp" />

                </LinearLayout>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="18 %"
                    android:textColor="#000000"
                    android:textSize="14sp" />

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentEnd="true"
                        android:layout_marginStart="6dp"
                        android:text="11.25 AM"
                        android:textColor="#000000"
                        android:textSize="14sp" />
                </RelativeLayout>
            </LinearLayout>
        </LinearLayout>
    </androidx.cardview.widget.CardView>

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="173dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="20dp"
        app:cardCornerRadius="8dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/bg2"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="30dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="30dp"
                android:orientation="horizontal">

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Delhi"
                        android:textColor="@color/white"
                        android:textSize="22sp" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="2 days ago"
                        android:textColor="@color/white"
                        android:textSize="14sp" />
                </LinearLayout>

            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginStart="30dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="30dp"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="39"
                    android:textColor="@color/white"
                    android:textSize="28sp" />

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="6dp"
                        android:text="o"
                        android:textColor="@color/white"
                        android:textSize="13sp" />

                </LinearLayout>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="35 %"
                    android:textColor="@color/white"
                    android:textSize="14sp" />

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentEnd="true"
                        android:layout_marginStart="6dp"
                        android:text="01.05 PM"
                        android:textColor="#D6D6D6"
                        android:textSize="14sp" />
                </RelativeLayout>
            </LinearLayout>
        </LinearLayout>
    </androidx.cardview.widget.CardView>

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="173dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="20dp"
        app:cardCornerRadius="8dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/bg3"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="30dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="30dp"
                android:orientation="horizontal">

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Darjeeling"
                        android:textColor="#000000"
                        android:textSize="22sp" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="2 weeks ago"
                        android:textColor="#000000"
                        android:textSize="14sp" />
                </LinearLayout>

            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginStart="30dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="30dp"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="12"
                    android:textColor="#000000"
                    android:textSize="28sp" />

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="6dp"
                        android:text="o"
                        android:textColor="#000000"
                        android:textSize="13sp" />

                </LinearLayout>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="9 %"
                    android:textColor="#000000"
                    android:textSize="14sp" />

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentEnd="true"
                        android:layout_marginStart="6dp"
                        android:text="05.00 AM"
                        android:textColor="#000000"
                        android:textSize="14sp" />
                </RelativeLayout>
            </LinearLayout>
        </LinearLayout>
    </androidx.cardview.widget.CardView>
</LinearLayout>

October 25, 20201 minuteVivek Beladiya