实际上，我试图通过使用Effectsfactory类来实现“图像效果”，即可绘制文件夹中的图像。它的工作正常。 实际上我使用此链接“http://grishma102.blogspot.in/2013/10/apply-effects-on-image-using-effects.html”代码。 我使用的代码是..
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
import android.media.effect.Effect;
import android.media.effect.EffectContext;
import android.media.effect.EffectFactory;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.opengl.GLUtils;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
public class MainActivity extends Activity implements GLSurfaceView.Renderer {
private GLSurfaceView mEffectView;
private int[] mTextures = new int[2];
private EffectContext mEffectContext;
private Effect mEffect;
private ThirdActivity mTexRenderer = new ThirdActivity();
private int mImageWidth;
private int mImageHeight;
private boolean mInitialized = false;
int mCurrentEffect;
public void setCurrentEffect(int effect) {
mCurrentEffect = effect;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
/**
* Initialise the renderer and tell it to only render when
* Explicit requested with the RENDERMODE_WHEN_DIRTY option
*/
mEffectView = (GLSurfaceView) findViewById(R.id.effectsview);
mEffectView.setEGLContextClientVersion(2);
mEffectView.setRenderer(this);
mEffectView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
mCurrentEffect = R.id.none;
}
private void loadTextures() {
// Generate textures
GLES20.glGenTextures(2, mTextures, 0);
// Load input bitmap
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.puppy);
mImageWidth = bitmap.getWidth();
mImageHeight = bitmap.getHeight();
mTexRenderer.updateTextureSize(mImageWidth, mImageHeight);
// Upload to texture
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextures[0]);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
// Set texture parameters
SecondActivity.initTexParams();
}
@SuppressLint("InlinedApi") @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) private void initEffect() {
EffectFactory effectFactory = mEffectContext.getFactory();
if (mEffect != null) {
mEffect.release();
}
/**
* Initialize the correct effect based on the selected menu/action item
*/
switch (mCurrentEffect) {
case R.id.none:
break;
case R.id.autofix:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_AUTOFIX);
mEffect.setParameter("scale", 0.5f);
break;
case R.id.bw:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_BLACKWHITE);
mEffect.setParameter("black", .1f);
mEffect.setParameter("white", .7f);
break;
case R.id.brightness:
mEffect = effectFactory.createEffect (EffectFactory.EFFECT_BRIGHTNESS);
mEffect.setParameter("brightness", 2.0f);
break;
case R.id.contrast:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_CONTRAST);
mEffect.setParameter("contrast", 1.4f);
break;
case R.id.crossprocess:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_CROSSPROCESS);
break;
case R.id.documentary:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_DOCUMENTARY);
break;
case R.id.duotone:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_DUOTONE);
mEffect.setParameter("first_color", Color.YELLOW);
mEffect.setParameter("second_color", Color.DKGRAY);
break;
case R.id.filllight:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FILLLIGHT);
mEffect.setParameter("strength", .8f);
break;
case R.id.fisheye:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FISHEYE);
mEffect.setParameter("scale", .5f);
break;
case R.id.flipvert:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FLIP);
mEffect.setParameter("vertical", true);
break;
case R.id.fliphor:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FLIP);
mEffect.setParameter("horizontal", true);
break;
case R.id.grain:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_GRAIN);
mEffect.setParameter("strength", 1.0f);
break;
case R.id.grayscale:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_GRAYSCALE);
break;
case R.id.lomoish:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_LOMOISH);
break;
case R.id.negative:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_NEGATIVE);
break;
case R.id.posterize:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_POSTERIZE);
break;
case R.id.rotate:
mEffect = effectFactory.createEffect( EffectFactory.EFFECT_ROTATE);
mEffect.setParameter("angle", 180);
break;
case R.id.saturate:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_SATURATE);
mEffect.setParameter("scale", .5f);
break;
case R.id.sepia:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_SEPIA);
break;
case R.id.sharpen:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_SHARPEN);
break;
case R.id.temperature:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_TEMPERATURE);
mEffect.setParameter("scale", .9f);
break;
case R.id.tint:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_TINT);
mEffect.setParameter("tint", Color.MAGENTA);
break;
case R.id.vignette:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_VIGNETTE);
mEffect.setParameter("scale", .5f);
break;
default:
break;
}
}
@SuppressLint("NewApi") private void applyEffect() {
mEffect.apply(mTextures[0], mImageWidth, mImageHeight, mTextures[1]);
}
private void renderResult() {
if (mCurrentEffect != R.id.none) {
// if no effect is chosen, just render the original bitmap
mTexRenderer.renderTexture(mTextures[1]);
}
else {
// render the result of applyEffect()
mTexRenderer.renderTexture(mTextures[0]);
}
}
@SuppressLint("NewApi") @Override
public void onDrawFrame(GL10 gl) {
if (!mInitialized) {
//Only need to do this once
mEffectContext = EffectContext.createWithCurrentGlContext();
mTexRenderer.init();
loadTextures();
mInitialized = true;
}
if (mCurrentEffect != R.id.none) {
//if an effect is chosen initialize it and apply it to the texture
initEffect();
applyEffect();
}
renderResult();
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
if (mTexRenderer != null) {
mTexRenderer.updateViewSize(width, height);
}
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
setCurrentEffect(item.getItemId());
mEffectView.requestRender();
return true;
}
}
但我想从图库中选择图像，对于该图像我想要应用效果。为此，我使用了这段代码
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.media.effect.Effect;
import android.media.effect.EffectContext;
import android.media.effect.EffectFactory;
import android.net.Uri;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.opengl.GLUtils;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity implements GLSurfaceView.Renderer {
private static int RESULT_LOAD_IMAGE = 1;
private GLSurfaceView mEffectView;
private int[] mTextures = new int[2];
private EffectContext mEffectContext;
private Effect mEffect;
private ThirdActivity mTexRenderer = new ThirdActivity();
private int mImageWidth;
private int mImageHeight;
private boolean mInitialized = false;
int mCurrentEffect;
// private Bitmap bitmap;
public void setCurrentEffect(int effect) {
mCurrentEffect = effect;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
Button buttonLoadImage = (Button) findViewById(R.id.button1);
buttonLoadImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
/**
* Initialise the renderer and tell it to only render when
* Explicit requested with the RENDERMODE_WHEN_DIRTY option
*/
mEffectView = (GLSurfaceView) findViewById(R.id.effectsview);
mEffectView.setEGLContextClientVersion(2);
mEffectView.setRenderer(this);
mEffectView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
mCurrentEffect = R.id.none;
}
private void loadTextures() {
// Generate textures
GLES20.glGenTextures(2, mTextures, 0);
// Load input bitmap
// Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.puppy);
Bitmap bitmap =BitmapFactory.decodeResource(getResources(),R.id.imgView);
mImageWidth = bitmap.getWidth();
mImageHeight = bitmap.getHeight();
mTexRenderer.updateTextureSize(mImageWidth, mImageHeight);
// Upload to texture
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextures[0]);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
// Set texture parameters
SecondActivity.initTexParams();
}
@SuppressLint("InlinedApi") @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) private void initEffect() {
EffectFactory effectFactory = mEffectContext.getFactory();
if (mEffect != null) {
mEffect.release();
}
/**
* Initialize the correct effect based on the selected menu/action item
*/
switch (mCurrentEffect) {
case R.id.none:
break;
case R.id.autofix:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_AUTOFIX);
mEffect.setParameter("scale", 0.5f);
break;
case R.id.bw:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_BLACKWHITE);
mEffect.setParameter("black", .1f);
mEffect.setParameter("white", .7f);
break;
case R.id.brightness:
mEffect = effectFactory.createEffect (EffectFactory.EFFECT_BRIGHTNESS);
mEffect.setParameter("brightness", 2.0f);
break;
case R.id.contrast:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_CONTRAST);
mEffect.setParameter("contrast", 1.4f);
break;
case R.id.crossprocess:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_CROSSPROCESS);
break;
case R.id.documentary:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_DOCUMENTARY);
break;
case R.id.duotone:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_DUOTONE);
mEffect.setParameter("first_color", Color.YELLOW);
mEffect.setParameter("second_color", Color.DKGRAY);
break;
case R.id.filllight:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FILLLIGHT);
mEffect.setParameter("strength", .8f);
break;
case R.id.fisheye:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FISHEYE);
mEffect.setParameter("scale", .5f);
break;
case R.id.flipvert:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FLIP);
mEffect.setParameter("vertical", true);
break;
case R.id.fliphor:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_FLIP);
mEffect.setParameter("horizontal", true);
break;
case R.id.grain:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_GRAIN);
mEffect.setParameter("strength", 1.0f);
break;
case R.id.grayscale:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_GRAYSCALE);
break;
case R.id.lomoish:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_LOMOISH);
break;
case R.id.negative:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_NEGATIVE);
break;
case R.id.posterize:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_POSTERIZE);
break;
case R.id.rotate:
mEffect = effectFactory.createEffect( EffectFactory.EFFECT_ROTATE);
mEffect.setParameter("angle", 180);
break;
case R.id.saturate:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_SATURATE);
mEffect.setParameter("scale", .5f);
break;
case R.id.sepia:
mEffect = effectFactory.createEffect(EffectFactory.EFFECT_SEPIA);
break;
case R.id.sharpen:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_SHARPEN);
break;
case R.id.temperature:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_TEMPERATURE);
mEffect.setParameter("scale", .9f);
break;
case R.id.tint:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_TINT);
mEffect.setParameter("tint", Color.MAGENTA);
break;
case R.id.vignette:
mEffect = effectFactory.createEffect(
EffectFactory.EFFECT_VIGNETTE);
mEffect.setParameter("scale", .5f);
break;
default:
break;
}
}
@SuppressLint("NewApi") private void applyEffect() {
mEffect.apply(mTextures[0], mImageWidth, mImageHeight, mTextures[1]);
}
private void renderResult() {
if (mCurrentEffect != R.id.none) {
// if no effect is chosen, just render the original bitmap
mTexRenderer.renderTexture(mTextures[1]);
}
else {
// render the result of applyEffect()
mTexRenderer.renderTexture(mTextures[0]);
}
}
@SuppressLint("NewApi") @Override
public void onDrawFrame(GL10 gl) {
if (!mInitialized) {
//Only need to do this once
mEffectContext = EffectContext.createWithCurrentGlContext();
mTexRenderer.init();
loadTextures();
mInitialized = true;
}
if (mCurrentEffect != R.id.none) {
//if an effect is chosen initialize it and apply it to the texture
initEffect();
applyEffect();
}
renderResult();
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
if (mTexRenderer != null) {
mTexRenderer.updateViewSize(width, height);
}
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
setCurrentEffect(item.getItemId());
mEffectView.requestRender();
return true;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
ImageView imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
}
}
但它显示以下错误
01-27 15：21：19.010：E / AndroidRuntime（26361）：致命异常：GLThread 2743 01-27 15：21：19.010：E / AndroidRuntime（26361）：java.lang.NullPointerException 01-27 15：21：19.010：E / AndroidRuntime（26361）：at com.example.imageeffect.MainActivity.loadTextures（MainActivity.java:92） 01-27 15：21：19.010：E / AndroidRuntime（26361）：at com.example.imageeffect.MainActivity.onDrawFrame（MainActivity.java:270） 01-27 15：21：19.010：E / AndroidRuntime（26361）：在android.opengl.GLSurfaceView $ GLThread.guardedRun（GLSurfaceView.java:1464） 01-27 15：21：19.010：E / AndroidRuntime（26361）：在android.opengl.GLSurfaceView $ GLThread.run（GLSurfaceView.java:121
请帮我解决这个问题。