New widget: TextureView

Bug #4343984

TextureView can be used to render media content (video, OpenGL,
RenderScript) inside a View.

The key difference with SurfaceView is that TextureView does
not create a new Surface. This gives the ability to seamlessly
transform, animate, fade, etc. a TextureView, which was hard
if not impossible to do with a SurfaceView.
A TextureView also interacts perfectly with ScrollView,
ListView, etc. It allows application to embed media content
in a much more flexible way than before.

For instance, to render the camera preview at 50% opacity,
all you need to do is the following:

mTextureView.setAlpha(0.5f);
Camera c = Camera.open();
c.setPreviewTexture(mTextureView.getSurfaceTexture());
c.startPreview();

TextureView uses a SurfaceTexture to get the job done. More
APIs are required to make it easy to create OpenGL contexts
for a TextureView. It can currently be done with a bit of
JNI code.

Change-Id: Iaa7953097ab5beb8437bcbbfa03b2df5b7f80cd7

1 files changed, 87 insertions, 0 deletions

diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/TextureViewActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/TextureViewActivity.java
new file mode 100644
index 0000000..4726672
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/TextureViewActivity.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.test.hwui;
+
+import android.animation.ObjectAnimator;
+import android.animation.ValueAnimator;
+import android.app.Activity;
+import android.graphics.SurfaceTexture;
+import android.hardware.Camera;
+import android.os.Bundle;
+import android.view.Gravity;
+import android.view.TextureView;
+import android.view.View;
+import android.widget.FrameLayout;
+
+import java.io.IOException;
+
+@SuppressWarnings({"UnusedDeclaration"})
+public class TextureViewActivity extends Activity implements TextureView.SurfaceTextureListener {
+    private Camera mCamera;
+    private TextureView mTextureView;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mTextureView = new TextureView(this);
+        mTextureView.setSurfaceTextureListener(this);
+
+        setContentView(mTextureView, new FrameLayout.LayoutParams(500, 400, Gravity.CENTER));
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+
+        mCamera.stopPreview();
+        mCamera.release();
+    }
+
+    @Override
+    public void onSurfaceTextureAvailable(SurfaceTexture surface) {
+        mCamera = Camera.open();
+
+        try {
+            mCamera.setPreviewTexture(surface);
+        } catch (IOException t) {
+            android.util.Log.e("TextureView", "Cannot set preview texture target!", t);
+        }
+
+        mCamera.startPreview();
+
+        mTextureView.setCameraDistance(5000);
+
+        ObjectAnimator animator = ObjectAnimator.ofFloat(mTextureView, "rotationY", 0.0f, 360.0f);
+        animator.setRepeatMode(ObjectAnimator.REVERSE);
+        animator.setRepeatCount(ObjectAnimator.INFINITE);
+        animator.setDuration(4000);
+        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator animation) {
+                ((View) mTextureView.getParent()).invalidate();
+            }
+        });
+        animator.start();
+
+        animator = ObjectAnimator.ofFloat(mTextureView, "alpha", 1.0f, 0.0f);
+        animator.setRepeatMode(ObjectAnimator.REVERSE);
+        animator.setRepeatCount(ObjectAnimator.INFINITE);
+        animator.setDuration(4000);
+        animator.start();
+    }
+}