安卓实时获取帧率的Java代码
时间: 2023-09-05 07:15:08 浏览: 227
安卓源码获取当前屏幕分辨率
你可以使用Android提供的Choreographer类来获取帧率。
首先,在你的Activity或Fragment中创建一个Choreographer.FrameCallback对象:
```
private final Choreographer.FrameCallback mFrameCallback = new Choreographer.FrameCallback() {
@Override
public void doFrame(long frameTimeNanos) {
// 在这里进行帧率的计算
mChoreographer.postFrameCallback(mFrameCallback);
}
};
```
然后,在onResume()方法中注册FrameCallback:
```
@Override
public void onResume() {
super.onResume();
mChoreographer = Choreographer.getInstance();
mChoreographer.postFrameCallback(mFrameCallback);
}
```
在onPause()方法中注销FrameCallback:
```
@Override
public void onPause() {
super.onPause();
mChoreographer.removeFrameCallback(mFrameCallback);
}
```
最后,你可以在FrameCallback的doFrame()方法中计算帧率:
```
private final Choreographer.FrameCallback mFrameCallback = new Choreographer.FrameCallback() {
private long mLastFrameTime = 0;
private int mFrameCount = 0;
@Override
public void doFrame(long frameTimeNanos) {
if (mLastFrameTime != 0) {
long diff = frameTimeNanos - mLastFrameTime;
double fps = 1e9 / diff;
Log.d(TAG, "FPS: " + fps);
}
mLastFrameTime = frameTimeNanos;
mFrameCount++;
mChoreographer.postFrameCallback(mFrameCallback);
}
};
```
在这个例子中,我们每帧都会计算帧率,并且将其输出到Logcat。你可以根据需要修改代码,将帧率的值保存到变量中、显示在UI界面上或者进行其他操作。
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