[Android] TextureView 使用照相機 (CAMERA) 的方法

package com.example.fan.text1;

import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;

import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.TextureView;
import android.widget.FrameLayout;
import android.widget.Toast;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class text1 extends AppCompatActivity implements TextureView.SurfaceTextureListener {

    InterstitialAd mInterstitialAd;

    private TextureView myTexture;
    private Camera mCamera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_text1);

        if (!this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
            ActivityCompat.requestPermissions(this, new String[] {android.Manifest.permission.READ_CONTACTS, android.Manifest.permission.WRITE_CONTACTS, android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.ACCESS_FINE_LOCATION, android.Manifest.permission.CAMERA},1);
            //Snackbar.make(mView, "沒照相機", Snackbar.LENGTH_LONG).setAction("Action", null).show();
        }

//=============方法一

         myTexture = new TextureView(this);
         myTexture.setSurfaceTextureListener(this);
         setContentView(myTexture);

//============方法二
        setContentView(R.layout.activity_text1);
        myTexture = (TextureView) findViewById(R.id.textureView);
        myTexture.setSurfaceTextureListener(this);

    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
       // Camera.Size previewSize = mCamera.getParameters().getPreviewSize();
        //myTexture.setLayoutParams(new FrameLayout.LayoutParams(previewSize.width, previewSize.height, Gravity.CENTER));
        mCamera = Camera.open();

        try {
            mCamera.setPreviewTexture(surface);
            mCamera.startPreview();
        } catch (IOException ioe) {
            // Something bad happened
        }

       myTexture.setAlpha(1.0f);//透明度，變化範圍是0.0f到1.0f之間，一般用於漸變動畫。
       myTexture.setRotation(90.0f);//轉向
    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

    }

    @Override
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
        mCamera.stopPreview();
        mCamera.release();
        return true;
    }

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surface) {

    }
}

資料來源：https://developer.android.com/reference/android/view/TextureView.html