package com.item.demo.photo.activity;
import android.Manifest;
import android.app.LoaderManager;
import android.content.ContentResolver;
import android.content.Context;
import android.content.CursorLoader;
import android.content.Intent;
import android.content.Loader;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import com.item.demo.photo.BuildConfig;
import com.item.demo.photo.R;
import com.item.demo.photo.adapter.MyPhotoAdapter;
import com.item.demo.photo.uilts.Image;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
/**
 * 圖片選擇界面
 */
public class MyPhotoActivity extends AppCompatActivity {
  private static final int REQUEST_CAPTURE = 100;
  //private static final int REQUEST_PICK = 101;
  private static final int REQUEST_CROP_PHOTO = 102;
  public static final int FINSH_RESULT = 104;//截圖后的返回
  private static final int LOADER_ID = 0x0100;
  private LoadCallBack mLoad = new LoadCallBack();
  private MyPhotoAdapter mAdapter;
  private List<Image> images = new ArrayList<>();
  //調用照相機返回圖片文件
  private File tempFile;
  private static final int MIN_IMAGE_FILE_SIZE = 10 * 1024; // 最小的圖片大小
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my_photo);
    GridView gv_photo = (GridView)findViewById(R.id.gv_photo);
    ImageView img_back = (ImageView)findViewById(R.id.iv_back);
    images.add(new Image());
    mAdapter = new MyPhotoAdapter(this,images);
    gv_photo.setAdapter(mAdapter);
    gv_photo.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        if(i == 0){
          //第一個就去照相
          if(hasPermission(new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE})){
            gotoCamera();
          }else {
            requestPermission(0x02,new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE});
          }
        }else {
          //這里點擊獲取到圖片地址然后裁剪
          gotoClipActivity(Uri.parse(images.get(i).getPath()));
        }
      }
    });
    img_back.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        finish();
      }
    });
  }
  @Override
  protected void onStart() {
    super.onStart();
    if(hasPermission(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE})){
      getLoaderManager().initLoader(LOADER_ID,null,mLoad);
    }else {
      requestPermission(0x01,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE});
    }
  }
  private class LoadCallBack implements LoaderManager.LoaderCallbacks<Cursor>{
    private final String[] IMAGE_PROJECTION = new String[]{
        MediaStore.Images.Media._ID,//Id
        MediaStore.Images.Media.DATA,//圖片路徑
        MediaStore.Images.Media.DATE_ADDED//圖片的創建時間
    };
    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
      //創建一個Loader
      if(id == LOADER_ID){
        //如果是我們的ID則進行初始化
        return new CursorLoader(getBaseContext(),
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            IMAGE_PROJECTION,
            null,
            null,
            IMAGE_PROJECTION[2] + " DESC");
      }
      return null;
    }
    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
      //當Loader加載完成時
      List<Image> images = new ArrayList<>();
      //判斷是否有數據
      if(data != null){
        int count = data.getCount();
        if(count > 0){
          data.moveToFirst();
          // 得到對應的列的Index坐標
          int indexId = data.getColumnIndexOrThrow(IMAGE_PROJECTION[0]);
          int indexPath = data.getColumnIndexOrThrow(IMAGE_PROJECTION[1]);
          int indexDate = data.getColumnIndexOrThrow(IMAGE_PROJECTION[2]);
          do {
            // 循環讀取，直到沒有下一條數據
            int id = data.getInt(indexId);
            String path = data.getString(indexPath);
            long dateTime = data.getLong(indexDate);
            File file = new File(path);
            if (!file.exists() || file.length() < MIN_IMAGE_FILE_SIZE) {
              // 如果沒有圖片，或者圖片大小太小，則跳過
              continue;
            }
            // 添加一條新的數據
            Image image = new Image();
            image.setId(id);
            image.setPath(path);
            image.setDate(dateTime);
            images.add(image);
          } while (data.moveToNext());
        }
      }
      updateSource(images);
    }
    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
      updateSource(null);
    }
  }
  /**
   * 通知Adapter數據更改的方法
   * @param images 新的數據
   */
  private void updateSource(List<Image> images){
    this.images.clear();
    this.images.add(new Image());
    if(images == null || images.size() == 0) return;
    this.images.addAll(images);
    mAdapter.notifyDataSetChanged();
  }
  /**
   *權限的返回
   */
  @Override
  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch(requestCode){
      case 0x02:
        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
          gotoCamera();
        }
        break;
      case 0x01:
        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
          getLoaderManager().initLoader(LOADER_ID,null,mLoad);
        }
    }
  }
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode){
      case REQUEST_CAPTURE://系統相機返回
        if(resultCode == RESULT_OK){
          Log.d("jiejie","--------相機---------" + Uri.fromFile(tempFile).toString());
          Log.d("jiejie","--------path----------" + getRealFilePathFromUri(MyPhotoActivity.this,Uri.fromFile(tempFile)));
          gotoClipActivity(Uri.fromFile(tempFile));
        }
        break;
      case REQUEST_CROP_PHOTO:
        if(resultCode == RESULT_OK){
          if(data != null){
            Uri uri = data.getData();
            Log.d("jiejie","-------------" + data.getData().getPath());
            String cropImagePath = getRealFilePathFromUri(MyPhotoActivity.this,uri);
            Log.d("jiejie","------crop--------" + cropImagePath);
            Intent intent = new Intent();
            intent.putExtra("image",cropImagePath);
            setResult(FINSH_RESULT,intent);
            MyPhotoActivity.this.finish();
          }
        }
        break;
    }
  }
  /**
   * 跳轉到系統照相機
   */
  private void gotoCamera(){
    String SDState = Environment.getExternalStorageState();
    //判斷SD卡是否存在
    if(SDState.equals(Environment.MEDIA_MOUNTED)){
      tempFile = new File(checkDirPath(Environment.getExternalStorageDirectory().getPath()+ "/image/"), System.currentTimeMillis() + ".jpg");
      //隱式的打開調用系統相冊
      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){
        intent.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        //如果是7.0及以上的系統使用FileProvider的方式創建一個Uri
        Uri contentUri = FileProvider.getUriForFile(MyPhotoActivity.this, BuildConfig.APPLICATION_ID + ".fileProvider", tempFile);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, contentUri);
      }else {
        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempFile));
      }
      startActivityForResult(intent,REQUEST_CAPTURE);
    }
  }
  /**
   * 打開截圖的界面
   * @param uri
   */
  private void gotoClipActivity(Uri uri){
    if(uri == null){
      return;
    }
    Intent intent = new Intent(this,ClipImageActivity.class);
    intent.putExtra("type",1);
    intent.setData(uri);
    startActivityForResult(intent,REQUEST_CROP_PHOTO);
  }
  /**
   * 檢查文件是否存在
   */
  private static String checkDirPath(String dirPath) {
    if (TextUtils.isEmpty(dirPath)) {
      return "";
    }
    File dir = new File(dirPath);
    if (!dir.exists()) {
      dir.mkdirs();
    }
    return dirPath;
  }
  /**
   * 判斷是否有指定的權限
   */
  public boolean hasPermission(String... permissions) {
    for (String permisson : permissions) {
      if (ContextCompat.checkSelfPermission(this, permisson)
          != PackageManager.PERMISSION_GRANTED) {
        return false;
      }
    }
    return true;
  }
  /**
   * 申請指定的權限.
   */
  public void requestPermission(int code, String... permissions) {
    if (Build.VERSION.SDK_INT >= 23) {
      requestPermissions(permissions, code);
    }
  }
  /**
   * 根據Uri返回文件絕對路徑
   * 兼容了file:///開頭的 和 content://開頭的情況
   */
  public static String getRealFilePathFromUri(final Context context, final Uri uri) {
    if (null == uri) return null;
    final String scheme = uri.getScheme();
    String data = null;
    if (scheme == null)
      data = uri.getPath();
    else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
      data = uri.getPath();
    } else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
      Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.ImageColumns.DATA}, null, null, null);
      if (null != cursor) {
        if (cursor.moveToFirst()) {
          int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
          if (index > -1) {
            data = cursor.getString(index);
          }
        }
        cursor.close();
      }
    }
    return data;
  }
}

  <provider
      android:name="android.support.v4.content.FileProvider"
      android:authorities="com.item.demo.photo.fileProvider"
      android:grantUriPermissions="true"
      android:exported="false">
      <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
    </provider>

package com.item.demo.photo.activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import com.item.demo.photo.R;
import com.item.demo.photo.view.ClipViewLayout;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
/**
 * 圖片剪切
 */
public class ClipImageActivity extends AppCompatActivity implements View.OnClickListener {
  private ClipViewLayout clipViewLayout1;
  private ClipViewLayout clipViewLayout2;
  private ImageView back;
  private TextView tv_ok;
  //類別 1：圓形 2：方形
  private int type;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_clip_image);
    type = getIntent().getIntExtra("type",1);
    initView();
  }
  private void initView() {
    clipViewLayout1 = (ClipViewLayout)findViewById(R.id.clipViewLayout1);
    clipViewLayout2 = (ClipViewLayout)findViewById(R.id.clipViewLayout2);
    back = (ImageView)findViewById(R.id.iv_back);
    tv_ok = (TextView)findViewById(R.id.tv_ok);
    back.setOnClickListener(this);
    tv_ok.setOnClickListener(this);
  }
  @Override
  protected void onResume() {
    super.onResume();
    if(type == 1){
      clipViewLayout1.setVisibility(View.VISIBLE);
      clipViewLayout2.setVisibility(View.GONE);
      //設置圖片資源
      clipViewLayout1.setImageSrc(getIntent().getData());
    }else {
      clipViewLayout2.setVisibility(View.VISIBLE);
      clipViewLayout1.setVisibility(View.GONE);
      clipViewLayout2.setImageSrc(getIntent().getData());
    }
  }
  @Override
  public void onClick(View view) {
    switch (view.getId()){
      case R.id.iv_back:
        finish();
        break;
      case R.id.tv_ok:
        generateUriAndReturn();
        break;
    }
  }
  /**
   * 生成Uri并且通過setResult返回給打開的Activity
   */
  private void generateUriAndReturn() {
    //調用返回剪切圖
    Bitmap zoomedCropBitmap;
    if (type == 1) {
      zoomedCropBitmap = clipViewLayout1.clip();
    } else {
      zoomedCropBitmap = clipViewLayout2.clip();
    }
    if (zoomedCropBitmap == null) {
      Log.e("android", "zoomedCropBitmap == null");
      return;
    }
    Uri mSaveUri = Uri.fromFile(new File(getCacheDir(), "cropped_" + System.currentTimeMillis() + ".jpg"));
    if (mSaveUri != null) {
      OutputStream outputStream = null;
      try {
        outputStream = getContentResolver().openOutputStream(mSaveUri);
        if (outputStream != null) {
          zoomedCropBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream);
        }
      } catch (IOException ex) {
        Log.e("android", "Cannot open file: " + mSaveUri, ex);
      } finally {
        if (outputStream != null) {
          try {
            outputStream.close();
          } catch (IOException e) {
            e.printStackTrace();
          }
        }
      }
      Intent intent = new Intent();
      intent.setData(mSaveUri);
      setResult(RESULT_OK, intent);
      finish();
    }
  }
}