android – Page 1552 – Tarik Billa

How to start new activity on button click

September 9, 2022 by Tarik

Easy. Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class); myIntent.putExtra(“key”, value); //Optional parameters CurrentActivity.this.startActivity(myIntent); Extras are retrieved on the other side via: @Override protected void onCreate(Bundle savedInstanceState) { Intent intent = getIntent(); String value = intent.getStringExtra(“key”); //if it’s a string you stored. } Don’t forget to add your new activity in the AndroidManifest.xml: <activity android:label=”@string/app_name” android:name=”NextActivity”/>

Set ImageView width and height programmatically?

September 8, 2022 by Tarik

It may be too late but for the sake of others who have the same problem, to set the height of the ImageView: imageView.getLayoutParams().height = 20; Important. If you’re setting the height after the layout has already been ‘laid out’, make sure you also call: imageView.requestLayout();

How to make a background 20% transparent on Android

September 8, 2022 by Tarik

Use the below code for black: <color name=”black”>#000000</color> Now if I want to use opacity then you can use the below code: <color name=”black”>#99000000</color> <!– 99 is for alpha and others pairs zero’s are for R G B –> And below for opacity code: and all opacity level here Hex Opacity Values 100% — FF … Read more

AsyncTask Android example

September 8, 2022 by Tarik

My full answer is here, but here is an explanatory image to supplement the other answers on this page. For me, understanding where all the variables were going was the most confusing part in the beginning.

How to check internet access on Android? InetAddress never times out

September 8, 2022 by Tarik

If the device is in airplane mode (or presumably in other situations where there’s no available network), cm.getActiveNetworkInfo() will be null, so you need to add a null check. Modified (Eddie’s solution) below: public boolean isOnline() { ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); return netInfo != null && netInfo.isConnectedOrConnecting(); } Also add … Read more

Get root view from current activity

September 8, 2022 by Tarik

If you need root view of your activity (so you can add your contents there) use findViewById(android.R.id.content).getRootView() Also it was reported that on some devices you have to use getWindow().getDecorView().findViewById(android.R.id.content) instead. Please note that as Booger reported, this may be behind navigation bar (with back button etc.) on some devices (but it seems on most … Read more

How can I avoid concurrency problems when using SQLite on Android?

September 8, 2022 by Tarik

Inserts, updates, deletes and reads are generally OK from multiple threads, but Brad’s answer is not correct. You have to be careful with how you create your connections and use them. There are situations where your update calls will fail, even if your database doesn’t get corrupted. The basic answer. The SqliteOpenHelper object holds on … Read more

Using context in a fragment

September 8, 2022 by Tarik

You can use getActivity(), which returns the activity associated with a fragment. The activity is a context (since Activity extends Context).

Detect whether there is an Internet connection available on Android [duplicate]

September 8, 2022 by Tarik

The getActiveNetworkInfo() method of ConnectivityManager returns a NetworkInfo instance representing the first connected network interface it can find or null if none of the interfaces are connected. Checking if this method returns null should be enough to tell if an internet connection is available or not. private boolean isNetworkAvailable() { ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); … Read more

Standard Android Button with a different color

September 8, 2022 by Tarik

I discovered that this can all be done in one file fairly easily. Put something like the following code in a file named custom_button.xml and then set background=”@drawable/custom_button” in your button view: <?xml version=”1.0″ encoding=”utf-8″?> <selector xmlns:android=”http://schemas.android.com/apk/res/android”> <item android:state_pressed=”true” > <shape> <gradient android:startColor=”@color/yellow1″ android:endColor=”@color/yellow2″ android:angle=”270″ /> <stroke android:width=”3dp” android:color=”@color/grey05″ /> <corners android:radius=”3dp” /> <padding android:left=”10dp” … Read more