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Code Issues Packages Projects Releases Wiki Activity

implement touch to focus

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tibbi 2016-04-17 21:58:01 +02:00
parent 681f4ec901
commit b319fcb8b5
1 changed files with 57 additions and 1 deletions
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58
app/src/main/java/com/simplemobiletools/camera/Preview.java
View File

@ -4,13 +4,16 @@ import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.hardware.Camera;
import android.media.ExifInterface;
import android.media.MediaScannerConnection;
import android.os.Environment;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import java.io.File;
@ -18,12 +21,14 @@ import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class Preview extends ViewGroup implements SurfaceHolder.Callback {
public class Preview extends ViewGroup implements SurfaceHolder.Callback, View.OnTouchListener {
private static final String TAG = Preview.class.getSimpleName();
private static final int MEDIA_TYPE_IMAGE = 1;
private static final int FOCUS_AREA_SIZE = 200;
private static Context context;
private static SurfaceHolder surfaceHolder;
@ -45,6 +50,7 @@ public class Preview extends ViewGroup implements SurfaceHolder.Callback {
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
setOnTouchListener(this);
}
public void setCamera(Camera newCamera) {
@ -151,6 +157,50 @@ public class Preview extends ViewGroup implements SurfaceHolder.Callback {
MediaScannerConnection.scanFile(context, photoPath, null, null);
}
private void focusArea(MotionEvent event) {
if (camera == null)
return;
camera.cancelAutoFocus();
Rect focusRect = calculateFocusArea(event.getX(), event.getY());
final Camera.Parameters parameters = camera.getParameters();
if (parameters.getMaxNumFocusAreas() > 0) {
final List<Camera.Area> focusAreas = new ArrayList<>(1);
focusAreas.add(new Camera.Area(focusRect, 1000));
parameters.setFocusAreas(focusAreas);
}
camera.setParameters(parameters);
camera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
camera.cancelAutoFocus();
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
camera.setParameters(parameters);
}
});
}
private Rect calculateFocusArea(float x, float y) {
int left = clamp(Float.valueOf((x / surfaceView.getWidth()) * 2000 - 1000).intValue());
int top = clamp(Float.valueOf((y / surfaceView.getHeight()) * 2000 - 1000).intValue());
return new Rect(left, top, Math.min(left + FOCUS_AREA_SIZE, 1000), Math.min(top + FOCUS_AREA_SIZE, 1000));
}
private int clamp(int touchCoord) {
if (Math.abs(touchCoord) + FOCUS_AREA_SIZE / 2 > 1000) {
if (touchCoord > 0) {
return 1000 - FOCUS_AREA_SIZE / 2;
} else {
return -1000 + FOCUS_AREA_SIZE / 2;
}
}
return touchCoord - FOCUS_AREA_SIZE / 2;
}
public void releaseCamera() {
if (camera != null) {
camera.stopPreview();
@ -235,4 +285,10 @@ public class Preview extends ViewGroup implements SurfaceHolder.Callback {
previewSize = getOptimalPreviewSize(supportedPreviewSizes, width, height);
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
focusArea(event);
return false;
}
}