Android runtime permission setup code for android studio
Android runtime permission setup code for android studio
Declare the permission(s) you need in your app’s manifest file (AndroidManifest.xml). Add the following lines within the <manifest> tags:
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
Replace CAMERA and READ_CONTACTS with the specific permissions your app requires.
- Request permissions from the user in your activity or fragment. Here’s an example code snippet for requesting the camera and contacts permissions:
java
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
public class MainActivity extends AppCompatActivity {
private static final int PERMISSION_REQUEST_CAMERA = 1;
private static final int PERMISSION_REQUEST_CONTACTS = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Check if the camera permission is granted
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
// Permission is not granted, request it
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, PERMISSION_REQUEST_CAMERA);
} else {
// Permission is already granted
// Start using the camera
openCamera();
}
// Check if the contacts permission is granted
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
// Permission is not granted, request it
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CONTACTS}, PERMISSION_REQUEST_CONTACTS);
} else {
// Permission is already granted
// Access contacts
readContacts();
}
}
// Handle the permission request result
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == PERMISSION_REQUEST_CAMERA) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Camera permission granted
openCamera();
} else {
// Camera permission denied
Toast.makeText(this, "Camera permission denied", Toast.LENGTH_SHORT).show();
}
} else if (requestCode == PERMISSION_REQUEST_CONTACTS) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Contacts permission granted
readContacts();
} else {
// Contacts permission denied
Toast.makeText(this, "Contacts permission denied", Toast.LENGTH_SHORT).show();
}
}
}
// Method to handle camera-related functionality
private void openCamera() {
// Implement your camera-related code here
Toast.makeText(this, "Camera permission granted. You can open the camera now.", Toast.LENGTH_SHORT).show();
}
// Method to handle contacts-related functionality
private void readContacts() {
// Implement your contacts-related code here
Toast.makeText(this, "Contacts permission granted. You can access contacts now.", Toast.LENGTH_SHORT).show();
}
}Display a network error HTML page in Android Studio
To display a network error HTML page in Android Studio, you can create a WebView and load an HTML file when there is a network error. Here’s an example code snippet:
- Create an HTML file named
network_error.htmlin theassetsdirectory of your Android project. Add the following content to the HTML file:
htmlCopy code<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Network Error</title>
<style>
body {
font-family: Arial, sans-serif;
text-align: center;
padding: 20px;
}
h1 {
color: #FF0000;
}
p {
font-size: 18px;
}
</style>
</head>
<body>
<h1>Network Error</h1>
<p>There was a problem connecting to the network.</p>
</body>
</html>
- In your activity or fragment, add a WebView to your layout XML file (e.g.,
activity_main.xmlorfragment_main.xml). For example:
xmlCopy code<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
- In your activity or fragment, load the network error HTML page when there is a network error. Here’s an example code snippet:
javaCopy codeimport android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = findViewById(R.id.webView);
// Check network connectivity
if (!isNetworkAvailable()) {
// Load the network error HTML page
webView.loadDataWithBaseURL("file:///android_asset/", "<html><body>" +
"<h1>Network Error</h1>" +
"<p>There was a problem connecting to the network.</p>" +
"</body></html>", "text/html", "UTF-8", null);
} else {
// Load your normal web content
webView.loadUrl("https://www.example.com");
}
// Configure the WebView client
webView.setWebViewClient(new WebViewClient());
}
// Method to check network connectivity
private boolean isNetworkAvailable() {
// Implement your network availability check logic here
// Return true if network is available, false otherwise
return true;
}
}
In this example, we check the network connectivity using the isNetworkAvailable() method. If there is no network connection, we load the network_error.html file using the loadDataWithBaseURL() method of the WebView. If the network is available, we load your normal web content by calling loadUrl() on the WebView.
Make sure to replace "https://www.example.com" with the actual URL you want to load when the network is available. Additionally, modify the network availability check logic in the isNetworkAvailable() method according to your requirements.
Remember to handle the necessary network permissions in the AndroidManifest.xml file.
How to set swipe to reload webview
To implement swipe-to-reload functionality for a WebView in Android Studio, you can use the SwipeRefreshLayout class provided by the Android framework. Here’s an example code snippet:
- In your activity or fragment layout XML file (e.g.,
activity_main.xmlorfragment_main.xml), wrap the WebView with a SwipeRefreshLayout. For example:
xmlCopy code<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
- In your activity or fragment code, initialize the SwipeRefreshLayout and implement the swipe-to-reload functionality. Here’s an example code snippet:
javaCopy codeimport android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
public class MainActivity extends AppCompatActivity {
private WebView webView;
private SwipeRefreshLayout swipeRefreshLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = findViewById(R.id.webView);
swipeRefreshLayout = findViewById(R.id.swipeRefreshLayout);
// Configure the WebView client
webView.setWebViewClient(new WebViewClient());
// Load your initial web content
webView.loadUrl("https://www.example.com");
// Set up swipe-to-reload functionality
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
// Reload the WebView
webView.reload();
}
});
// Configure the SwipeRefreshLayout colors (optional)
swipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary, R.color.colorAccent);
}
}
In this example, we wrap the WebView with a SwipeRefreshLayout in the layout XML file. We initialize the WebView and SwipeRefreshLayout objects in the activity’s onCreate() method. We also set a WebViewClient for the WebView to handle URL loading.
To implement swipe-to-reload functionality, we set an OnRefreshListener on the SwipeRefreshLayout. When the user performs a swipe gesture, the onRefresh() method is called, and we simply call webView.reload() to reload the web content.
You can customize the appearance of the SwipeRefreshLayout by modifying its colors using setColorSchemeResources(), if desired.
Ensure that you have the necessary dependencies in your app’s build.gradle file:
groovyCopy codeimplementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
Remember to handle any necessary internet permissions in the AndroidManifest.xml file.