How to automatically switch colors in Android frame layout
This article introduces the "Android frame layout how to automatically switch colors" related knowledge, in the actual case of the operation process, many people will encounter such a dilemma, and then let the editor lead you to learn how to deal with these situations! I hope you can read it carefully and be able to achieve something!
Effect:
Achieve:
Activity_main.xml
ActivityMain.java
Import android.graphics.Color;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.TextView;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {private TextView tvBottom; private TextView tvMiddle; private TextView tvTop; private int [] colors; private Handler handler; private Thread thread; private boolean isRunning @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); / / set the user interface setContentView (R.layout.activity_main) using the layout resource; / / get the control instance tvBottom = findViewById (R.id.tvBottom) through the resource identifier; tvMiddle = findViewById (R.id.tvMiddle); tvTop = findViewById (R.id.tvTop) / / initialize the color array colors = new int [] {Color.RED, Color.BLUE, Color.GREEN}; handler = new Handler () {@ Override public void handleMessage (@ NonNull Message msg) {super.handleMessage (msg) If (msg.what = = 0x0001) {/ / switch color int temp = colors [0]; for (int I = 0; I < colors.length-1; iSue +) {colors [I] = colors [I + 1] } colors [colors.length-1] = temp; / / set the background color of the three-layer label according to the switched color array tvBottom.setBackgroundColor (colors [0]); tvMiddle.setBackgroundColor (colors [1]); tvTop.setBackgroundColor (colors [2]) };} / * [start] button Click event handling method * / public void doStart (View view) {/ / set thread running control variable isRunning = true / / create child threads to send messages thread = new Thread regularly (new Runnable () {@ Override public void run () {while (isRunning) {/ / send messages handler.sendEmptyMessage (0x0001) to the main thread) / / Let the thread sleep for 500ms try {Thread.sleep (500);} catch (InterruptedException e) {e.printStackTrace ();}) / / start thread thread.start ();} / * [stop] button Click event handling method * / public void doStop (View view) {/ / set thread running control variable isRunning = false; / / destroy child threads thread = null;}}
String.xml
Frame layout: color switching bottom layer, middle layer, top layer begins and ends, "how to automatically switch colors in Android frame layout" is introduced here. Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!
