android - 拍照时在相机上绘制文字

Question

我使用 this 开发了一个安卓相机应用程序tutorials点教程
我的目的是在打开应用程序时输入一个文本，我希望在拍摄图像时显示该文本
我在拍摄时使用表面 View 来显示图像预览，但现在我想在拍摄图像时在屏幕上显示文本(实时)
this答案似乎是在捕获图像后绘制文本，即在保存图像时，但我想在拍照时显示文本
文本的位置应该固定
是的，我想在保存时将该文本保存在图像中，即我不想只显示文本，但它也应该保存在图像中
我没有发布任何代码，因为它与链接中的相同，但我会在需要时更新问题
谢谢。

代码(MainActivity.java):

  package com.campg.sonix.campgs;

  import android.content.res.Configuration;
  import android.hardware.Camera;
  import android.hardware.Camera.PictureCallback;
  import android.hardware.Camera.ShutterCallback;

  import android.hardware.SensorManager;
  import android.media.ExifInterface;
  import android.os.BatteryManager;
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;

  import android.support.v7.app.AppCompatActivity;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.OrientationEventListener;
  import android.view.Surface;
  import android.view.SurfaceHolder;
  import android.view.SurfaceView;
  import android.view.View;


  import android.widget.Toast;

  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;

  import java.util.ArrayList;
  import java.util.Set;


  public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
      Camera camera;
      SurfaceView surfaceView;
      SurfaceHolder surfaceHolder;
      OrientationEventListener orientationEventListener;
      Camera.PictureCallback rawCallback;
      Camera.ShutterCallback shutterCallback;
      Camera.PictureCallback jpegCallback;
      private Camera.Size csize;

      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          orientationEventListener
                  = new OrientationEventListener(this,  SensorManager.SENSOR_DELAY_NORMAL){

              @Override
              public void onOrientationChanged(int orientation) {
                  // TODO Auto-generated method stub
                 try {
                     if (orientation == ORIENTATION_UNKNOWN) return;
                     android.hardware.Camera.CameraInfo info =
                             new android.hardware.Camera.CameraInfo();
                     android.hardware.Camera.getCameraInfo(i, info);
                     orientation = (orientation + 45) / 90 * 90;
                     int rotation = 0;
                     if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                         rotation = (info.orientation - orientation + 360) % 360;
                     } else {  // back-facing camera
                         rotation = (info.orientation + orientation) % 360;
                     }
               Camera.Parameters mParameters;
               mParameters = camera.getParameters();
               mParameters.setRotation(rotation);

               Log.d("orientation is",String.valueOf(orientation));

           }
           catch (Exception e)
           {
               Log.e("orien exc", "exception", e);

           }

        }};

    if (orientationEventListener.canDetectOrientation()){
        Toast.makeText(this, "Can DetectOrientation", Toast.LENGTH_LONG).show();
        orientationEventListener.enable();
    }
    else{
        Toast.makeText(this, "Can't DetectOrientation", Toast.LENGTH_LONG).show();
        finish();
    }
    Log.i("oncre","ate");
    surfaceView = (SurfaceView) findViewById(R.id.surfaceView1);

    surfaceHolder = surfaceView.getHolder();
    Log.i("ya", "ya");

    surfaceHolder.addCallback(this);
    Log.i("ya1", "ya2");

    surfaceHolder.setType(surfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    Log.i("ya3", "ya4");

    jpegCallback = new PictureCallback() {

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            FileOutputStream outputStream =null;

            try {
                outputStream = new FileOutputStream(String.format("/sdcard/%d.jpg", System.currentTimeMillis()));
                outputStream.write(data);
                outputStream.close();
                Log.i("yaha1", "yaha1");

                Log.d("Log", "onPictureTaken - wrote bytes: " + data.length);
            }
            catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            catch (IOException e) {
                Log.e("hii2", "exception", e);
                e.printStackTrace();
            }  finally {
            }
            Toast.makeText(getApplicationContext(), "Saved", Toast.LENGTH_LONG).show();
            refreshCamera();
        }
    };
}

public void captureImage(View v) throws IOException {
    try {
        camera.takePicture(null, null, jpegCallback);

    }
    catch (NullPointerException e)
    {
        Log.i("m here", "m here");

        Log.e("hey br", "exception", e);

    }
    catch (IllegalStateException e)
    {
        Log.e("hii 12 4", "exception", e);

    }
    catch (RuntimeException e)
    {
        Log.e("hii 12 4", "exception", e);

    }

}

public void refreshCamera()
{
        if(surfaceHolder.getSurface() == null)
            return;
    try
    {
        camera.stopPreview();
    }
    catch (Exception e)
    {
    }
    try
    {
    camera.setPreviewDisplay(surfaceHolder);
        camera.startPreview();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    return true;
}
@Override
protected void onDestroy()
{
    super.onDestroy();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    return super.onOptionsItemSelected(item);
}
public static void setCameraDisplayOrientation(MainActivity activity,
                                               int cameraId, Camera camera) {
   try
   {
    Log.i("inside", "inside");

    android.hardware.Camera.CameraInfo info =
            new android.hardware.Camera.CameraInfo();
    android.hardware.Camera.getCameraInfo(cameraId, info);
    int rotation = activity.getWindowManager().getDefaultDisplay()
            .getRotation();
    int degrees = 0;
    switch (rotation) {
        case Surface.ROTATION_0: degrees = 0; break;
        case Surface.ROTATION_90: degrees = 90; break;
        case Surface.ROTATION_180: degrees = 180; break;
        case Surface.ROTATION_270: degrees = 270; break;
    }

    int result;
    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        result = (info.orientation + degrees) % 360;
        result = (360 - result) % 360;  // compensate the mirror
    } else {  // back-facing
        result = (info.orientation - degrees + 360) % 360;
    }
    camera.setDisplayOrientation(result);
   }
   catch (Exception e) {
       Log.e("inside", "exception", e);
   }
}



int i;

@Override
public void surfaceCreated(SurfaceHolder holder)
{

    try {
        camera=Camera.open(i);
        camera.setDisplayOrientation(180);

        Log.i("m here", "m here");

    }
    catch (RuntimeException e) {
        System.err.println(e);
        Log.e("hey", "exception", e);

        return;
    }
    Log.i("aftr", "aftr");
    try
    {
        Camera.Parameters param;
        param = camera.getParameters();
        String currentversion = android.os.Build.VERSION.SDK;
        Log.d("System out", "currentVersion " + currentversion);
        int currentInt = android.os.Build.VERSION.SDK_INT;
        Log.d("System out", "currentVersion " + currentInt);
        param.set("orientation", "portrait");

      if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
            if (currentInt != 7) {
                camera.setDisplayOrientation(90);
            } else {
                Log.d("System out", "Portrait " + currentInt);

                param.setRotation(90);


              param.set("orientation", "portrait");
              param.set("rotation",90);

                camera.setParameters(param);
            }
        }
       if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
            // camera.setDisplayOrientation(0);
            if (currentInt != 7) {
                camera.setDisplayOrientation(0);
            } else {
                Log.d("System out", "Landscape " + currentInt);
                param.set("orientation", "landscape");
                param.set("rotation", 90);
                camera.setParameters(param);
            }
        }

        param.setPreviewSize(288,352 );
        camera.setPreviewDisplay(surfaceHolder);
        camera.startPreview();
        Toast.makeText(getApplicationContext(), "hi 2", Toast.LENGTH_LONG).show();
    }
    catch (Exception e) {
        System.err.println(e);
        return;
    }

}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{

    try
{
    setCameraDisplayOrientation(this,i,camera);
    refreshCamera();
    Log.i("inside sfc", "inside sfc");

}
catch (Exception e) {
    Log.e("surfacechan", "exception", e);
    System.err.println(e);
    return;
}
}

@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
    try {
        camera.stopPreview();
        camera.release();
        camera = null;
    }
    catch (Exception e){
        System.err.println(e);
        return;
    }

    }}

list :

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.campg.sonix.campgs"
    android:versionCode="1"
    android:versionName="1.0">

    <uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"

        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

XML 文件:-

<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="match_parent"
android:layout_margin="3dp"
android:layout_height= "0dp"
android:layout_weight="1" />

<LinearLayout
android:id="@+id/capture"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="captureImage"
android:clickable="true"
android:orientation="vertical"
android:gravity="center"
 >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="10dp"
android:text="Capture"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

Answer 1

用于在预览中添加文本，

1)扩展Surfaceview类

2) 通过覆盖 onDraw() 调用添加文本(或按钮等)

例如，创建一个新类 CameraOverlaySurfaceView(而不是代码中的 SurfaceView surfaceView；):

public class CameraOverlaySurfaceView extends SurfaceView {
public CameraOverlaySurfaceView(Context ctx)  { /* Do init */
    super(ctx);
    setWillNotDraw(false);
}

@Override
protected void onDraw(Canvas canv) { 
  /* Draw text like in 
  http://stackoverflow.com/questions/2655402/android-canvas-drawtext
 */
}

用于将文本与捕获的图像一起保存为文件，

1)在jpegcallback中，需要手动在需要的位置添加Text位图，重新编码存储。