Friday, May 22, 2015

How to set TextView text color transparent programmatically in Android

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity"
    android:background="@android:color/white"
    >
    <ImageView
        android:id="@+id/iv"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@drawable/animal"
        android:scaleType="centerInside"
        />
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sample TextView..."
        android:padding="25dp"
        android:textSize="30dp"
        android:textStyle="bold"
        android:textColor="#ff2023ff"
        />
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Text Color Transparent"
        android:layout_below="@id/tv"
        />
</RelativeLayout>
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MainActivity extends Activity{

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

        // Get the widgets reference from XML layout
        RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        final TextView tv = (TextView) findViewById(R.id.tv);
        Button btn = (Button) findViewById(R.id.btn);

        // Set a click listener for Button widget
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /*
                    withAlpha(int alpha)
                        Creates a new ColorStateList that has the same states and
                        colors as this one but where each color has the
                        specified alpha value (0-255).
                 */
                // Set Text color transparent 50%
                tv.setTextColor(tv.getTextColors().withAlpha(128));
            }
        });
    }
}
More android examples