Question

我写了一个从活动开始的livewallpaper，活动使用了libgdx的opengl20。当我第一次开始活动时没有问题，但第二次活壁纸崩溃了。有时使用shader.begin()，而不是每次都使用<application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".MainActivity" android:label="@string/app_name" android:screenOrientation="portrait" android:configChanges="keyboard|keyboardHidden|orientation|screenSize"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".LivewallpaperSettings" android:label="Livewallpaper Settings" android:parentActivityName="com.me.mygdxgame.MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> </intent-filter> </activity> <service android:name=".LiveWallpaper" android:label="@string/app_name" android:permission="android.permission.BIND_WALLPAPER"> <intent-filter> <action android:name="android.service.wallpaper.WallpaperService" /> </intent-filter> <meta-data android:name="android.service.wallpaper" android:resource="@xml/livewallpaper" /> </service> </application>。当我没有从那时开始活动那里没有问题。

的AndroidManifest.xml

            Intent i = new Intent();
            if (Build.VERSION.SDK_INT > 15)
            {
                i.setAction(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
                String pkg = LiveWallpaper.class.getPackage().getName();
                String cls = LiveWallpaper.class.getCanonicalName();
                i.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT, new ComponentName(pkg, cls));

            }
            else
            {
                i.setAction(WallpaperManager.ACTION_LIVE_WALLPAPER_CHOOSER);
            }
            startActivityForResult(i, 0);

启动livewallpaper代码

    vertexShader = "attribute vec4 a_Position;    \n"
                    + "attribute vec2 a_texCoords;    \n"
                    + "uniform mat4 u_mvp_matrix;\n"
                    + "varying vec2 v_texCoords;     \n"
                    + "void main()                   \n"
                    + "{                             \n"
            //      + "   gl_Position = a_Position;  \n"
                    + " gl_Position = u_mvp_matrix * a_Position;\n"
                    + "   v_texCoords = a_texCoords;  \n"
                    + "}                             \n";

// this one tells it what goes in between the points (i.e
// colour/texture)
  fragmentShader = "#ifdef GL_ES                \n"
                      + "precision mediump float;    \n"
                      + "#endif                      \n"
                      + "varying vec2 v_texCoords;   \n"
                      + "uniform sampler2D u_texture;\n"
                      + "void main()                 \n"
                      + "{                           \n"
                     // + "  gl_FragColor = vec4(1.0,0.0,0.0,1.0);  \n"
                      + "  gl_FragColor =  texture2D(u_texture, v_texCoords);   \n"
                      + "}";
    meshShader = new ShaderProgram(vertexShader, fragmentShader);

崩溃信息

06-27 11:03:22.576: D/dalvikvm(7139): GC_CONCURRENT freed 246K, 13% free 11375K/12999K, paused 15ms+10ms, total 61ms
06-27 11:03:22.626: W/dalvikvm(7139): threadid=16: thread exiting with uncaught exception (group=0x40e4c300)
06-26 11:45:09.936: E/AndroidRuntime(19979): FATAL EXCEPTION: GLThread 9758
06-26 11:45:09.936: E/AndroidRuntime(19979): java.lang.NullPointerException
06-26 11:45:09.936: E/AndroidRuntime(19979):    at com.badlogic.gdx.graphics.glutils.ShaderProgram.begin(ShaderProgram.java:745)
06-26 11:45:09.936: E/AndroidRuntime(19979):    at com.wall.wall.MeshShaderTest.render(MeshShaderTest.java:78)
06-26 11:45:09.936: E/AndroidRuntime(19979):    at com.badlogic.gdx.backends.android.AndroidGraphicsLiveWallpaper.onDrawFrame(AndroidGraphicsLiveWallpaper.java:625)
06-26 11:45:09.936: E/AndroidRuntime(19979):    at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1546)
06-26 11:45:09.936: E/AndroidRuntime(19979):    at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1247)
06-26 11:45:09.941: E/Window(1782): Lynn . finish the function even if the screen is off.

着色器

我认为没有问题。

{{1}}

Answer 1

我敢打赌，您将MeshShaderTest个实例存储在static字段中，或者您将ShaderProgram（meshShader？）存储在{{1}中}}。但是，如果没有更多的代码，很难说。

当您快速重新启动活动时，Android可以重复使用先前初始化的DalvikVM，这意味着static字段将不会重新初始化。但是，由于抛弃了所有OpenGL上下文，任何引用Libgdx状态的对象都将过时。

有关详细信息，请参阅http://bitiotic.com/blog/2013/05/23/libgdx-and-android-application-lifecycle/

Answer 2

我通过在活动中添加“android：process =”：com.me.process.main“并在服务中添加android：process =”：com.me.process.sub“来改变我的AndroidManifest.xml。那么活动和服务不在一个过程中。因此他们的记忆不会导致问题。但我仍然不知道如何在同一过程中解决问题。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.me.mygdxgame"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="5" android:targetSdkVersion="17" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:process=":com.me.process.main"   >
            android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".LiveWallpaper"
            android:label="@string/app_name"
            android:permission="android.permission.BIND_WALLPAPER"
             android:process=":com.me.process.sub">
            <intent-filter>
                <action android:name="android.service.wallpaper.WallpaperService" />
            </intent-filter>
            <meta-data android:name="android.service.wallpaper"
                android:resource="@xml/livewallpaper" />
        </service>

    </application>

</manifest>

使用libgdx的livewallpaper崩溃

的AndroidManifest.xml

启动livewallpaper代码

崩溃信息

着色器

2 个答案: