我正在尝试将FrameLayout与Deprecated Camera API一起使用，根据android developer's site上的文档，我试图让应用程序内的相机预览有圆角。
Signup_Selfie_shot
package com.novateur.realtime;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Typeface;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.net.Uri;
import android.os.Environment;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TextView;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import org.w3c.dom.Text;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import static android.R.attr.data;
import static android.R.attr.id;
public class Signup_Selfie_shot extends Activity {
private Camera mCamera;
private CameraPreview mPreview;
// private StorageReference mStorage;
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
private Button btn1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup__selfie_shot);
Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/LeagueSpartan-Bold.ttf");
//mStorage = FirebaseStorage.getInstance().getReference();
TextView tx1 = (TextView) findViewById(R.id.smileText);
tx1.setTypeface(custom_font);
TextView tx2 = (TextView) findViewById(R.id.camTextView);
tx2.setTypeface(custom_font);
btn1 = (Button) findViewById(R.id.tapPicButton);
btn1.setTypeface(custom_font);
Button btn2 = (Button) findViewById(R.id.camNextButton);
btn2.setTypeface(custom_font);
// Create an instance of Camera----------------------------------------
mCamera = openFrontFacingCameraGingerbread();
//
//// Create our Preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.cameraView);
preview.addView(mPreview);
//----------------------------------------------------------------------
// Add a listener to the Capture button
btn1.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
// get an image from the camera
mCamera.takePicture(null, null, mPicture);
}
}
);
}
/** A safe way to get an instance of the Camera object. */
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
if (c != null){
Camera.Parameters params = c.getParameters();
c.setParameters(params);
}
}
catch (Exception e){
Log.d("DEBUG", "Camera did not open");
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
};
private static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "MyCameraApp");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_"+ timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
private Camera openFrontFacingCameraGingerbread() {
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try {
cam = Camera.open(camIdx);
} catch (RuntimeException e) {
Log.e("MyCameraApp", "Camera failed to open: " + e.getLocalizedMessage());
}
}
}
return cam;
}
}
布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.novateur.realtime.Signup_Selfie_shot">
<TextView
android:id="@+id/smileText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Smile,"
android:textSize="20sp"
android:textColor="#000000"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="50dp"
app:layout_constraintHorizontal_bias="0.502" />
<TextView
android:id="@+id/camTextView"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:text="You're on Camera "
android:textSize="20sp"
android:textColor="#000000"
app:layout_constraintHorizontal_bias="0.501"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/smileText" />
<FrameLayout
android:id="@+id/cameraSignUpPort"
android:layout_width="252dp"
android:layout_height="273dp"
android:layout_marginTop="22dp"
android:background="@drawable/view_red_bordered"
android:visibility="visible"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/camTextView" >
<FrameLayout
android:id="@+id/cameraView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</FrameLayout>
<Button
android:id="@+id/camNextButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:text="Next"
android:textSize="18sp"
android:textAllCaps="false"
android:textColor="#808080"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="50dp"
app:layout_constraintTop_toBottomOf="@+id/tapPicButton"
style="?android:attr/borderlessButtonStyle" />
<Button
android:id="@+id/tapPicButton"
android:layout_width="245sp"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:background="@drawable/view_red_filled"
android:text="Tap to take a pic!"
android:textSize="16sp"
android:textColor="#ffffff"
android:textAllCaps="false"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/cameraSignUpPort" />
</android.support.constraint.ConstraintLayout>
cameraPreview
package com.novateur.realtime;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d("DEBUG", "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d("DEBUG", "Error starting camera preview: " + e.getMessage());
}
}
}