Android?中TextureView和SurfaceView的屬性方法及示例說明

更新時間：2022年06月22日 10:35:47 作者：??芝麻粒兒????

這篇文章主要介紹了Android?中TextureView和SurfaceView的屬性方法及示例說明，文章圍繞主題展開詳細的內(nèi)容介紹，具有一定的參考價值，需要的小伙伴可以參考一下

實踐過程

SurfaceView屬性和方法

surfaceCreated(@NonNull SurfaceHolder holder)：surface創(chuàng)建時回調(diào)
surfaceDestroyed(@NonNull SurfaceHolder holder)：surface銷毀時回調(diào)
surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height)：surface發(fā)生變化時回調(diào)
SurfaceHolder.addCallback(context)：添加回調(diào)，也就是上面三個方法
lockCanvas()：獲取Canvas對象并鎖定畫布，調(diào)用Canvas進行繪圖，和unlockCanvasAndPost是依次成對出現(xiàn)。
unlockCanvasAndPost()：結束鎖定畫布，并且提交改變。和lockCanvas是依次成對出現(xiàn)。

TextureView屬性和方法

getSurfaceTexture（）：此方法返回此視圖使用的 SurfaceTexture。
getBitmap（整型寬度，整型高度）：此方法返回返回關聯(lián)表面紋理內(nèi)容的位圖表示形式。
getTransform（Matrix transform）：此方法返回與此紋理視圖關聯(lián)的轉換。
isOpaque（）：此方法指示此視圖是否不透明。
lockCanvas（）：此方法開始編輯曲面中的像素。
setOpaque（boolean opaque）：此方法指示此紋理視圖的內(nèi)容是否不透明。
setTransform（Matrix transform）：此方法將轉換設置為與此紋理視圖關聯(lián)。
unlockCanvasAndPost（Canvas canvas）：此方法完成對曲面中像素的編輯。
onSurfaceTextureAvailable(SurfaceTexture arg0, int arg1, int arg2)：創(chuàng)建的監(jiān)聽，前提開啟硬件加速
onSurfaceTextureDestroyed(SurfaceTexture arg0)：銷毀的監(jiān)聽
onSurfaceTextureSizeChanged(SurfaceTexture arg0, int arg1,int arg2)：變化的監(jiān)聽
onSurfaceTextureUpdated(SurfaceTexture arg0)：更新的監(jiān)聽

TextureView示例

public class MainActivity extends Activity implements SurfaceTextureListener{
??? private Camera mCamera;
??? private TextureView [mTextureView]();
??? protected void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? mTextureView = new TextureView(this);
??????? mTextureView.setSurfaceTextureListener(this);
??????? setContentView(mTextureView);
??? }

??? public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
??????? mCamera = Camera.open();
??????? try {
??????????? mCamera.setPreviewTexture(surface);
??????????? mCamera.startPreview();
????????????//可以修改透明度和旋轉方向
            mTextureView.setAlpha(1.0f);
            mTextureView.setRotation(90.0f);
??????? } catch (IOException ioe) {
??????????? // 異常處理
??????? }
??? }
??? public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
??? }
??? public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
??????? mCamera.stopPreview();
??????? mCamera.release();
??????? return true;
??? }
?? ?public void onSurfaceTextureUpdated(SurfaceTexture surface) {
??? }
}

SurfaceView示例

Java版本自定義

public class ECGSurfaceViewJava extends SurfaceView implements SurfaceHolder.Callback {
??? //簡單模擬一下數(shù)據(jù)
??? public List<Integer> ecgDatas = new ArrayList<>();
??? //矩陣? 畫布 畫筆 顏色
??? private Rect rect;
??? private Canvas mCanvas;
??? private Paint mPaint;? //畫波形的畫筆
??? private String line_color = "#01FC00";? //畫筆默認是綠色的
??? private int wave_speed = 30;//定義波速：30mm/s
??? private int sleepTime = 8;//每次鎖屏的時間間距，單位ms 連線的時間長度，，如果大則會卡頓效果
??? private SurfaceHolder surfaceHolder;
??? private boolean isCanRun = true;
??? private int mStartX = 0;
??? private int mStartY = 0;
??? private Runnable drawRunnable = new Runnable() {
??????? @Override
??????? public void run() {
??????????? while (isCanRun) {
?????????????? //在這獲取改view的寬度? 如果mStartX超過則歸位 這樣實現(xiàn)反復從頭畫，我這800只是簡單表示下效果
??????????????? if (mStartX > 800) {
??????????????????? mStartX = 0;
??????????????? }
??????????????? //繪制區(qū)域不斷向右變化
??????????????? rect.set(mStartX, 0, mStartX + 16, 300);
????????? ??????mCanvas = surfaceHolder.lockCanvas(rect);? //提交繪制區(qū)域
??????????????? if (mCanvas == null) return;
??????????????? //很重要，如果反復從頭繪制，會覆蓋上一次的繪制
??????????????? mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
??????????????? if (ecgDatas.size() > 0) {
??????????????????? mCanvas.drawLine(mStartX, mStartY, mStartX + 16, ecgDatas.get(0), mPaint);
??????????????????? //這個點的重點是下一個點的起點
??????????????????? mStartX = mStartX + 16;
??????????????????? mStartY = ecgDatas.get(0);
??????????????????? ecgDatas.remove(0);
??????????????? } else {
??????????????????? initData();
??????????????? }
??????????????? surfaceHolder.unlockCanvasAndPost(mCanvas);??? //這種方式把上次繪制的遮蓋了 因此出現(xiàn)了斷點
??????????? }
??????? }
??? };
??? public ECGSurfaceViewJava(Context context, AttributeSet attrs) {
??????? super(context, attrs);
??????? this.surfaceHolder = this.getHolder();//獲取holder
??????? this.surfaceHolder.addCallback(this);
??????? rect = new Rect();? //繪制矩陣內(nèi)
??????? mPaint = new Paint();
??????? mPaint.setColor(Color.parseColor(line_color));?? //畫筆顏色
??????? mPaint.setAntiAlias(true);?? //抗鋸齒
??????? mPaint.setStrokeWidth(2);
??????? initData();
??? }
??? private void initData() {
??????? ecgDatas.clear();
??????? for (int i = 0; i < 200; i++) {
??????????? ecgDatas.add((int) (Math.random() * 200));
??????? }
??????? mStartY = ecgDatas.get(0);
??? }
??? @Override
??? public void surfaceCreated(SurfaceHolder holder) {
??????? new Thread(drawRunnable).start();
??? }
??? @Override
??? public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
??? }
??? @Override
??? public void surfaceDestroyed(SurfaceHolder holder) {
??????? isCanRun = false;
??? }
}

Kotlin版本自定義

class ECGSurfaceViewKotlin(context: Context?, attrs: AttributeSet?) : SurfaceView(context, attrs), SurfaceHolder.Callback {
??? //簡單模擬一下數(shù)據(jù)
??? var ecgDatas: MutableList<Int> = ArrayList()
??? //矩陣? 畫布 畫筆 顏色
??? private var rect: Rect? = null
??? private var mCanvas: Canvas? = null
??? //畫波形的畫筆
??? private var mPaint: Paint? = null
??? private val line_color = "#01FC00" //畫筆默認是綠色的
??? private val wave_speed = 30 //定義波速：30mm/s
??? private val sleepTime = 8 //每次鎖屏的時間間距，單位ms 連線的時間長度，，如果大則會卡頓效果
??? var surfaceHolder: SurfaceHolder? = null
??? private var isCanRun = true
??? private var mStartX = 0
??? private var mStartY = 0
?
??? private val drawRunnable = Runnable {
??????? while (isCanRun) {
?????????? //在這獲取改view的寬度? 如果mStartX超過則歸位 這樣實現(xiàn)反復從頭畫，我這800只是簡單表示下效果
??????????? if (mStartX > 800) {
??????????????? mStartX = 0
??????????? }
??????????? //繪制區(qū)域不斷向右變化
??????????? rect!![mStartX, 0, mStartX + 16] = 300
??????????? mCanvas = surfaceHolder!!.lockCanvas(rect) //提交繪制區(qū)域
??????????? if (mCanvas == null) return@Runnable
??????????? //很重要，如果反復從頭繪制，會覆蓋上一次的繪制
??????????? mCanvas!!.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR)
??????????? if (ecgDatas.size > 0) {
??????????????? mCanvas!!.drawLine(mStartX.toFloat(), mStartY.toFloat(), (mStartX + 16).toFloat(), ecgDatas[0].toFloat(), mPaint)
??????????????? //這個點的重點是下一個點的起點
??????????????? mStartX = mStartX + 16
??????????????? mStartY = ecgDatas[0]
??????????????? ecgDatas.removeAt(0)
??????????? } else {
??????????????? initData()
??????????? }
??????????? surfaceHolder!!.unlockCanvasAndPost(mCanvas!!) //這種方式把上次繪制的遮蓋了 因此出現(xiàn)了斷點
??????? }
??? }
??? init {
??????? surfaceHolder = this.holder //獲取holder
??????? surfaceHolder!!.addCallback(this)
??????? rect = Rect() //繪制矩陣內(nèi)
??????? mPaint = Paint()
??????? mPaint!!.setColor(Color.parseColor(line_color)) //畫筆顏色
??????? mPaint!!.setAntiAlias(true) //抗鋸齒
?????? ?mPaint!!.setStrokeWidth(2f)
??????? initData()
??? }
??? private fun initData() {
??????? ecgDatas.clear()
??????? for (i in 0..199) {
??????????? ecgDatas.add((Math.random() * 200).toInt())
??????? }
??????? mStartY = ecgDatas[0]
??? }
??? override fun surfaceCreated(holder: SurfaceHolder?) {
??????? Thread(drawRunnable).start()
??? }

??? override fun surfaceChanged(holder: SurfaceHolder?, format: Int, width: Int, height: Int) {
??? }
??? override fun surfaceDestroyed(holder: SurfaceHolder?) {
?????? ?isCanRun = false
??? }
}

布局直接使用即可：

<cn.appstudy.customView.ECGSurfaceViewJava
??????? android:layout_width="match_parent"
??????? android:layout_height="200dp"/>
?
<cn.appstudy.customView.ECGSurfaceViewKotlin
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:layout_marginTop="220dp" />

上面小空只是簡單寫了下示例，如果是畫心電圖其實還有更多的邏輯，比如多個心電圖同步，比如超出屏幕后回到起始位置，比如實時更新心電圖數(shù)據(jù)，再比如心電圖速度控制等等。

而且上面心電圖示例是從左到右的，還有可能從上到下，從右到左的等等，更多功能就交給大佬們?nèi)ラ_發(fā)了。

到此這篇關于Android 中TextureView和SurfaceView的屬性方法及示例說明的文章就介紹到這了,更多相關Android extureView和SurfaceView 內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

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