效果以及需求

檢視原圖可點選放大，可兩指放大等

1.PopupWindow的簡單使用

PopupWindow最基本的三個條件是一定要設定的：View contentView，int width, int height
showAtLocation 視窗展示的位置
setOutsideTouchable(true)點選外面關閉PopupWindow，一定要在showAtLocation之前呼叫

View contentView = LayoutInflater.from(this).inflate(R.layout.pop_pic_photo, null);
 

popupWindow = new PopupWindow(contentView, ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
popupWindow.setOutsideTouchable(true);
popupWindow.showAtLocation(layout, Gravity.BOTTOM, 0, 0);

TextView load = contentView.findViewById(R.id.load);
load.setOnClickListener(this);

2.Android6.0許可權申請

// 現在清單檔案進行宣告
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
// 許可權申請
ActivityCompat.requestPermissions(,new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE},requestCode );

// 處理許可權回撥
 

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    // 相機許可權授予
    grantResults[0] == PackageManager.PERMISSION_GRANTED；
    // 儲存許可權授予
    grantResults[1] == PackageManager.PERMISSION_GRANTED；
}

3.呼叫系統相簿

// 開啟系統相簿
Intent intent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 123);

// onActivityResult進行回撥得到圖片路徑

if (requestCode == 123 && resultCode == Activity.RESULT_OK) {

    Uri selectedImage = data.getData();
    String[] filePathColumns = {MediaStore.Images.Media.DATA};
    Cursor c = getContentResolver().query(selectedImage, filePathColumns, null, null, null);
    c.moveToFirst();
    int columnIndex = c.getColumnIndex(filePathColumns[0]);
    // 圖片路徑
    String imagePath = c.getString(columnIndex);
    c.close();
}

4.呼叫系統相機

protected void open_camra() {

        Intent takeIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        String imageFileName = System.currentTimeMillis() + ".png";

        String path = Environment.getExternalStorageDirectory();

        // 定義生成圖片的路徑（全域性）
        StringpicPath = path+imageFileName;

        Uri mImageCaptureUri;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { //android7.0以上
            ContentValues contentValues = new ContentValues(1);
            contentValues.put(MediaStore.Images.Media.DATA, new File(path, imageFileName).getAbsolutePath());
            mImageCaptureUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
        } else {
            mImageCaptureUri = Uri.fromFile(new File(path, imageFileName));
        }

        takeIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
        startActivityForResult(takeIntent, 456);
}


// onActivityResult進行回撥得到圖片路徑

if (requestCode == 456 && resultCode == Activity.RESULT_OK) {

    // 圖片路徑
    StringpicPath
}

Luban.with(this)
        .load(photos)                                   // 傳人要壓縮的圖片列表
        .ignoreBy(100)                                  // 忽略不壓縮圖片的大小
        .setTargetDir(getPath())                        // 設定壓縮後文件儲存位置
        .setCompressListener(new OnCompressListener() { //設定回撥
          @Override
          public void onStart() {
            // TODO 壓縮開始前呼叫，可以在方法內啟動 loading UI
          }

          @Override
          public void onSuccess(File file) {
            // TODO 壓縮成功後呼叫，返回壓縮後的圖片檔案
          }

          @Override
          public void onError(Throwable e) {
            // TODO 當壓縮過程出現問題時呼叫
          }
        }).launch();    //啟動壓縮

6.圖片展示

protected void showImage(File file, ImageView img) {

        Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
        img.setImageBitmap(bitmap);
        img.setScaleType(ImageView.ScaleType.CENTER_CROP);
}

// root build.gradle
allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

// module build.gradle
compile 'com.github.chrisbanes:PhotoView:2.1.3'

<com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/photo_view"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


photoView.setImageBitmap(BitmapFactory.decodeFile(path));