android实现自定义相机以及图片的水印

最近在做图片的水印功能，也就研究了一下android的相机。在android中有两种方式可以进行拍照，一种是调用系统的拍照功能调用方式比较简单而且不需要权限。

调用方式：

//照相机中获取照片
public void getPhoto_FromCamera() {
try {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// 下面这句指定调用相机拍照后的照片存储的路径
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri
.fromFile(new File(Environment.getExternalStorageDirectory(), "photo.jpg")));
startActivityForResult(intent, 1);
} catch (ActivityNotFoundException e) {
e.printStackTrace();
}
}

这样在activity的回掉取出图片设置到我们的imageView就可以了。so easy！

接下来是自定义相机实现图片的拍照效果：

package qjdt.iwintrue.com.cameraapplication;

import android.content.Intent;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

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

public class CustomerCameraActivity extends AppCompatActivity implements SurfaceHolder.Callback  {

//声明一个camera对象
private  Camera  camera;
//图片的实时预览
private SurfaceView suf_camera;
private SurfaceHolder surfaceHolder;
//相机参数设置
private Camera.Parameters parameters;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_customer_camera);
suf_camera = (SurfaceView) findViewById(R.id.suf_camera);
surfaceHolder =  suf_camera.getHolder();
surfaceHolder.addCallback(this);

}

public void click(View view) {
switch (view.getId()){
case R.id.btn_start:
takePhoto();
break;
case R.id.btn_stop:
break;
}
}

public void takePhoto(){
parameters = camera.getParameters();
//设置照片格式
parameters.setPictureFormat(ImageFormat.JPEG);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
parameters.setPictureSize(400, 800);
camera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
FileOutputStream fileOutputStream = new FileOutputStream(new File(Environment.getExternalStorageDirectory().getAbsolutePath(),"temp.jpeg"));
fileOutputStream.write(data);
fileOutputStream.close();
Intent intent  = new Intent(CustomerCameraActivity.this,ResultActivity.class);
startActivity(intent);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}
});
}
});
//        camera.takePicture();
}

public  void  getCamera(){
//获取相机实例
if(camera==null)
camera = Camera.open();
}

public void releaseCamera(){
if(camera!=null){
camera.setPreviewCallback(null);
camera.stopPreview();
camera.release();
camera = null;
}

}

public  void  setPrive(Camera camera,SurfaceHolder surfaceHolder){
try {
camera.setPreviewDisplay(surfaceHolder);
//开始预览
camera.setDisplayOrientation(90);
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}

}

@Override
protected void onResume() {
super.onResume();
getCamera();
if(surfaceHolder!=null){
setPrive(camera,surfaceHolder);
}

}

@Override
protected void onPause() {
super.onPause();
releaseCamera();
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
setPrive(camera,surfaceHolder);

}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
camera.stopPreview();
setPrive(camera, surfaceHolder);
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
releaseCamera();

}
}

ResultActivity中就是一个ImageView来显示这张图片就不贴了。另外别往了加权限

对于图片的水印效果也很简单，就是当我们得倒bitmap的时候利用paint和Canvas来

重新绘制一张bitmap参考方法如下：

// 加水印 也可以加文字
public static Bitmap watermarkBitmap(Bitmap src, Bitmap watermark,
String title) {
if (src == null) {
return null;
}
int w = src.getWidth();
int h = src.getHeight();
//需要处理图片太大造成的内存超过的问题,这里我的图片很小所以不写相应代码了
Bitmap newb= Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
Canvas cv = new Canvas(newb);
cv.drawBitmap(src, 0, 0, null);// 在 0，0坐标开始画入src
Paint paint=new Paint();
//加入图片
if (watermark != null) {
int ww = watermark.getWidth();
int wh = watermark.getHeight();
paint.setAlpha(50);
cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, paint);// 在src的右下角画入水印
}
//加入文字
if(title!=null)
{
String familyName ="黑体";
Typeface font = Typeface.create(familyName,Typeface.NORMAL);
TextPaint textPaint=new TextPaint();
textPaint.setColor(Color.RED);
textPaint.setTypeface(font);
textPaint.setTextSize(100);
//这里是自动换行的
StaticLayout layout = new StaticLayout(title,textPaint,w,Layout.Alignment.ALIGN_NORMAL,1.0F,0.0F,true);
layout.draw(cv);
}
cv.save(Canvas.ALL_SAVE_FLAG);// 保存
cv.restore();// 存储
return newb;
}

通过这个方法你就可以对你的bitmap添加文字或者图片了。