[英]Libgdx Pixmap to Texture causes NullPointerException
我是LibGdx的新手,對此問題我不清楚。 我有一個字節的圖標數組,我想將它們轉換為Textures。(byte []-> Pixmap-> Texture)實際上看起來很簡單。
byte[][] y = loadIcons();
Pixmap[] icon = new Pixmap[100];
for(int k = 0; k < 100; k++){
if(y[k].length > 1000) {
icon[k] = new Pixmap(y[k], 0, y[k].length);
}
}
Texture iconTexture;
iconTexture = new Texture(icon[0]);
從byte []轉換為Pixmap可以正常工作,但是最后一個步驟實際上是最簡單的步驟,導致此問題:
java.lang.RuntimeException: Unable to start activity ComponentInfo{project## Heading ##}: java.lang.NullPointerException: Attempt to invoke interface method 'int com.badlogic.gdx.graphics.GL20.glGenTexture()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int com.badlogic.gdx.graphics.GL20.glGenTexture()' on a null object reference
at com.badlogic.gdx.graphics.Texture.<init>(Texture.java:120)
at com.badlogic.gdx.graphics.Texture.<init>(Texture.java:104)
at com.emis.htlauncher.AndroidLauncher.onCreate(AndroidLauncher.java:61)
at android.app.Activity.performCreate(Activity.java:5937)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
這可能是一個非常簡單的問題,我不知道為什么我不明白。
如果您嘗試在普通libgdx流之外訪問OpenGL(例如在單獨的線程中) ,則必須使用如下所示的主線程 :
Gdx.app.postRunnable(new Runnable() {
@Override
public void run() {
// create icons here, com.badlogic.gdx.graphics.GL20 won't be null here
}
});
加載資源的另一種(推薦)方法是使用AssetManager 。
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