I am a novice android app programmer and just started to code a game. I recently found a video where a red square should show up and would be allowed to be dragged. I made sure of it and copied the code exactly. Here are all of the pieces of code:
Main Activity:
package com.onemorelaugh.mads;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//makes full screen
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
//gets rid of title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(new GamePanel(this));
}
}
GamePanel:
package com.onemorelaugh.mads;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Point;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/**
* Created by OneMoreLaugh on 8/7/2016.
*/
public class GamePanel extends SurfaceView implements SurfaceHolder.Callback{
private MainThread thread;
private RectPlayer player;
private Point playerPoint;
public GamePanel(Context context){
super(context);
getHolder().addCallback(this);
thread = new MainThread(getHolder(),this);
player = new RectPlayer(new Rect(100, 100, 100, 100), Color.rgb(255, 0, 0));
playerPoint = new Point(150,150);
setFocusable(true);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height){
}
@Override
public void surfaceCreated(SurfaceHolder holder){
thread = new MainThread(getHolder(),this);
thread.setRunning(true);
thread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
while (true) {
try {
thread.setRunning(false);
thread.join();
} catch (Exception e) {e.printStackTrace();}
retry = false;
}
}
@Override
public boolean onTouchEvent(MotionEvent event){
//return super.onTouchEvent(event);
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
playerPoint.set((int)event.getX(), (int)event.getY());
}
return true;
}
public void update() {
player.update(playerPoint);
}
@Override
public void draw(Canvas canvas){
super.draw(canvas);
canvas.drawColor(Color.WHITE);
player.draw(canvas);
}
}
GameObject:
package com.onemorelaugh.mads;
import android.graphics.Canvas;
/**
* Created by OneMoreLaugh on 8/7/2016.
*/
public interface GameObject {
public void draw(Canvas canvas);
public void update();
}
RectPlayer:
package com.onemorelaugh.mads;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
/**
* Created by OneMoreLaugh on 8/7/2016.
*/
public class RectPlayer implements GameObject {
private Rect rectangle;
private int color;
public RectPlayer(Rect rectangle, int color){
this.rectangle = rectangle;
this.color = color;
}
@Override
public void draw(Canvas canvas){
Paint paint = new Paint();
paint.setColor(color);
canvas.drawRect(rectangle, paint);
}
@Override
public void update(){
}
public void update(Point point){
rectangle.set(point.x - rectangle.width()/2, point.y - rectangle.height()/2, point.x + rectangle.width()/2, point.y + rectangle.height()/2);
}
}
MainThread:
package com.onemorelaugh.mads;
import android.graphics.Canvas;
import android.view.SurfaceHolder;
/**
* Created by OneMoreLaugh on 8/7/2016.
*/
public class MainThread extends Thread{
public static final int MAX_FPS = 30;
private double averageFPS;
private SurfaceHolder surfaceHolder;
private GamePanel gamePanel;
private boolean running;
public static Canvas canvas;
public void setRunning(boolean running){
this.running = running;
}
public MainThread(SurfaceHolder surfaceHolder, GamePanel gamePanel){
super();
this.surfaceHolder = surfaceHolder;
this.gamePanel = gamePanel;
}
@Override
public void run(){
long startTime;
long timeMillis = 1000/MAX_FPS;
long waitTime;
int frameCount = 0;
long totalTime = 0;
long targetTime = 1000/MAX_FPS;
while(running){
startTime = System.nanoTime();
canvas = null;
try {
canvas = this.surfaceHolder.lockCanvas();
synchronized (surfaceHolder) {
this.gamePanel.update();
this.gamePanel.draw(canvas);
}
}catch(Exception e){e.printStackTrace();}
finally {
if(canvas != null){
try {
surfaceHolder.unlockCanvasAndPost(canvas);
}catch(Exception e) {e.printStackTrace();}
}
}
timeMillis = (System.nanoTime() - startTime)/1000000;
waitTime = targetTime - timeMillis;
try {
if (waitTime > 0)
this.sleep(waitTime);
}catch(Exception e){e.printStackTrace();}
totalTime += System.nanoTime() - startTime;
frameCount++;
if (frameCount == MAX_FPS){
averageFPS = 1000/((totalTime/frameCount)/1000000);
frameCount = 0;
totalTime = 0;
System.out.println(averageFPS);
}
}
}
}
Now I double checked this code and it worked for the guys in the video. When I try and run it, (I'm using android studio) the emulator pops up and shows the home screen of a phone after being black for a little. It is like the app crashed. Below are the error codes I get:
Information:Gradle tasks [:app:clean, :app:generateDebugSources, :app:prepareDebugUnitTestDependencies, :app:mockableAndroidJar, :app:generateDebugAndroidTestSources, :app:assembleDebug]
:app:clean
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAnimatedVectorDrawable2340Library
:app:prepareComAndroidSupportAppcompatV72340Library
:app:prepareComAndroidSupportSupportV42340Library
:app:prepareComAndroidSupportSupportVectorDrawable2340Library
:app:prepareDebugDependencies
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:generateDebugBuildConfig
:app:mergeDebugShaders
:app:compileDebugShaders
:app:generateDebugAssets
:app:mergeDebugAssets
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:preDebugUnitTestBuild UP-TO-DATE
:app:prepareDebugUnitTestDependencies
:app:mockableAndroidJar UP-TO-DATE
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:prepareDebugAndroidTestDependencies
:app:compileDebugAndroidTestAidl
:app:processDebugAndroidTestManifest
:app:compileDebugAndroidTestRenderscript
:app:generateDebugAndroidTestBuildConfig
:app:mergeDebugAndroidTestShaders
:app:compileDebugAndroidTestShaders
:app:generateDebugAndroidTestAssets
:app:mergeDebugAndroidTestAssets
:app:generateDebugAndroidTestResValues UP-TO-DATE
:app:generateDebugAndroidTestResources
:app:mergeDebugAndroidTestResources
:app:processDebugAndroidTestResources
:app:generateDebugAndroidTestSources
:app:incrementalDebugJavaCompilationSafeguard
:app:compileDebugJavaWithJavac
:app:compileDebugJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.).
:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources
:app:buildInfoDebugLoader
:app:transformClassesWithExtractJarsForDebug
:app:transformClassesWithInstantRunVerifierForDebug
:app:transformClassesWithJavaResourcesVerifierForDebug UP-TO-DATE
:app:mergeDebugJniLibFolders
:app:transformNative_libsWithMergeJniLibsForDebug
:app:processDebugJavaRes UP-TO-DATE
:app:transformResourcesWithMergeJavaResForDebug
:app:transformResourcesAndNative_libsWithJavaResourcesVerifierForDebug UP-TO-DATE
:app:transformClassesWithInstantRunForDebug
:app:transformClasses_enhancedWithInstant+reloadDexForDebug UP-TO-DATE
:app:incrementalDebugTasks
:app:prePackageMarkerForDebug
:app:fastDeployDebugExtractor
:app:generateDebugInstantRunAppInfo
:app:coldswapKickerDebug
:app:transformClassesWithInstantRunSlicerForDebug
:app:transformClassesWithDexForDebug
To run dex in process, the Gradle daemon needs a larger heap.
It currently has approximately 910 MB.
For faster builds, increase the maximum heap size for the Gradle daemon to more than 2048 MB.
To do this set org.gradle.jvmargs=-Xmx2048M in the project gradle.properties.
For more information see https://docs.gradle.org/current/userguide/build_environment.html
Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
Error: at java.lang.ClassLoader.defineClass1(Native Method)
Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
Error: at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
Error: at java.lang.ClassLoader.defineClass1(Native Method)
Error: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
Error: at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
Error: at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
Error: at java.security.AccessController.doPrivileged(Native Method)
Error: at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
Error: at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
Error: at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Error:Exception in thread "main"
Error: at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
Error: at java.lang.ClassLoader.defineClass1(Native Method)
Error: at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
Error: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
Error: at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
Error: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
Error: at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
Error: at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
Error: at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
Error: at java.lang.ClassLoader.defineClass1(Native Method)
Error: at java.security.AccessController.doPrivileged(Native Method)
Error: at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
:app:transformClassesWithDexForDebug FAILED
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
Error: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
Error: at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
Error: at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
Error: at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
Error: at java.security.AccessController.doPrivileged(Native Method)
Error: at java.security.AccessController.doPrivileged(Native Method)
Error: at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
Error: at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
Error: at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
Error: at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
FAILURE: Build failed with an exception.
Error: at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Error:Exception in thread "main"
* What went wrong:
Error: at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Error:Exception in thread "main"
Error: at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
Error: at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
Error: at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Error:Exception in thread "main"
Execution failed for task ':app:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: java.lang.RuntimeException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.7.0_79\bin\java.exe'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
Information:BUILD FAILED
Information:Total time: 4.702 secs
Information:59 errors
Information:0 warnings
Information:See complete output in console
I don't know what I am doing wrong. Thank you for your answers.
No comments:
Post a Comment