华为机型cordova-plugin-image-picker读取图库闪退

在测试cordova开发的安卓APP过程中，使用$cordovaImagePicker.getPictures(options)获取相册照片时，华为机型总是会闪退。

config.xml已经添加了权限

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.CAMERA" />

如果先调用相机$cordovaCamera.getPicture(options)弹出权限申请，赋予权限后再调用$cordovaImagePicker.getPictures(options)就不会闪退。

查看了一下调用相机插件cordova-plugin-camera源码org.apache.cordova.camera.CameraLauncher中的方法callTakePicture，可知其做了权限的检测，源码如下：

/**
     * Take a picture with the camera.
     * When an image is captured or the camera view is cancelled, the result is returned
     * in CordovaActivity.onActivityResult, which forwards the result to this.onActivityResult.
     *
     * The image can either be returned as a base64 string or a URI that points to the file.
     * To display base64 string in an img tag, set the source to:
     *      img.src="data:image/jpeg;base64,"+result;
     * or to display URI in an img tag
     *      img.src=result;
     *
     * @param returnType        Set the type of image to return.
     * @param encodingType           Compression quality hint (0-100: 0=low quality & high compression, 100=compress of max quality)
     */
    public void callTakePicture(int returnType, int encodingType) {
        boolean saveAlbumPermission = PermissionHelper.hasPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
        boolean takePicturePermission = PermissionHelper.hasPermission(this, Manifest.permission.CAMERA);

        // CB-10120: The CAMERA permission does not need to be requested unless it is declared
        // in AndroidManifest.xml. This plugin does not declare it, but others may and so we must
        // check the package info to determine if the permission is present.

        if (!takePicturePermission) {
            takePicturePermission = true;
            try {
                PackageManager packageManager = this.cordova.getActivity().getPackageManager();
                String[] permissionsInPackage = packageManager.getPackageInfo(this.cordova.getActivity().getPackageName(), PackageManager.GET_PERMISSIONS).requestedPermissions;
                if (permissionsInPackage != null) {
                    for (String permission : permissionsInPackage) {
                        if (permission.equals(Manifest.permission.CAMERA)) {
                            takePicturePermission = false;
                            break;
                        }
                    }
                }
            } catch (NameNotFoundException e) {
                // We are requesting the info for our package, so this should
                // never be caught
            }
        }

        if (takePicturePermission && saveAlbumPermission) {
            takePicture(returnType, encodingType);
        } else if (saveAlbumPermission && !takePicturePermission) {
            PermissionHelper.requestPermission(this, TAKE_PIC_SEC, Manifest.permission.CAMERA);
        } else if (!saveAlbumPermission && takePicturePermission) {
            PermissionHelper.requestPermission(this, TAKE_PIC_SEC, Manifest.permission.READ_EXTERNAL_STORAGE);
        } else {
            PermissionHelper.requestPermissions(this, TAKE_PIC_SEC, permissions);
        }
    }

然后又查看了一下cordova-plugin-image-picker插件com.synconset.ImagePicker.java的源码发现方法execute没有做权限检测直接执行this.cordova.startActivityForResult((CordovaPlugin) this, intent, 0)方法，而这个方法最终调用的是android.app.Activity.java中的startActivityForResult(intent, requestCode)方法。

android.app.Activity.java中startActivityForResult方法的源码：

/**
     * Same as calling {@link #startActivityForResult(Intent, int, Bundle)}
     * with no options.
     *
     * @param intent The intent to start.
     * @param requestCode If >= 0, this code will be returned in
     *                    onActivityResult() when the activity exits.
     *
     * @throws android.content.ActivityNotFoundException
     *
     * @see #startActivity
     */
    public void startActivityForResult(@RequiresPermission Intent intent, int requestCode) {
        startActivityForResult(intent, requestCode, null);
    }

可以看到这个方法加了@RequiresPermission，所以在没有权限的情况下直接调用可能会被拒绝。

所以需要在调用前申请权限。

解决：

这是com.synconset.ImagePicker.java插件源码：

/**
 * An Image Picker Plugin for Cordova/PhoneGap.
 */
package com.synconset;

import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin;

import org.apache.cordova.PermissionHelper;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;

public class ImagePicker extends CordovaPlugin {
    public static String TAG = "ImagePicker";

    private CallbackContext callbackContext;
    private JSONObject params;

    public boolean execute(String action, final JSONArray args, final CallbackContext callbackContext) throws JSONException {
         this.callbackContext = callbackContext;
         this.params = args.getJSONObject(0);
        if (action.equals("getPictures")) {
            Intent intent = new Intent(cordova.getActivity(), MultiImageChooserActivity.class);
            int max = 20;
            int desiredWidth = 0;
            int desiredHeight = 0;
            int quality = 100;
            if (this.params.has("maximumImagesCount")) {
                max = this.params.getInt("maximumImagesCount");
            }
            if (this.params.has("width")) {
                desiredWidth = this.params.getInt("width");
            }
            if (this.params.has("height")) {
                desiredHeight = this.params.getInt("height");
            }
            if (this.params.has("quality")) {
                quality = this.params.getInt("quality");
            }
            intent.putExtra("MAX_IMAGES", max);
            intent.putExtra("WIDTH", desiredWidth);
            intent.putExtra("HEIGHT", desiredHeight);
            intent.putExtra("QUALITY", quality);

　　　　　　　if (this.cordova != null) {
                 this.cordova.startActivityForResult((CordovaPlugin) this, intent, 0);
            }
        }
        return true;
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_OK && data != null) {
            ArrayList<String> fileNames = data.getStringArrayListExtra("MULTIPLEFILENAMES");
            JSONArray res = new JSONArray(fileNames);
            this.callbackContext.success(res);
        } else if (resultCode == Activity.RESULT_CANCELED && data != null) {
            String error = data.getStringExtra("ERRORMESSAGE");
            this.callbackContext.error(error);
        } else if (resultCode == Activity.RESULT_CANCELED) {
            JSONArray res = new JSONArray();
            this.callbackContext.success(res);
        } else {
            this.callbackContext.error("No images selected");
        }
    }
}

这是我修改后添加了权限申请的代码：

/**
 * An Image Picker Plugin for Cordova/PhoneGap.
 */
package com.synconset;

import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin;

import org.apache.cordova.PermissionHelper;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;

public class ImagePicker extends CordovaPlugin {
    public static String TAG = "ImagePicker";

    private CallbackContext callbackContext;
    private JSONObject params;

    public boolean execute(String action, final JSONArray args, final CallbackContext callbackContext) throws JSONException {
         this.callbackContext = callbackContext;
         this.params = args.getJSONObject(0);
        if (action.equals("getPictures")) {
            Intent intent = new Intent(cordova.getActivity(), MultiImageChooserActivity.class);
            int max = 20;
            int desiredWidth = 0;
            int desiredHeight = 0;
            int quality = 100;
            if (this.params.has("maximumImagesCount")) {
                max = this.params.getInt("maximumImagesCount");
            }
            if (this.params.has("width")) {
                desiredWidth = this.params.getInt("width");
            }
            if (this.params.has("height")) {
                desiredHeight = this.params.getInt("height");
            }
            if (this.params.has("quality")) {
                quality = this.params.getInt("quality");
            }
            intent.putExtra("MAX_IMAGES", max);
            intent.putExtra("WIDTH", desiredWidth);
            intent.putExtra("HEIGHT", desiredHeight);
            intent.putExtra("QUALITY", quality);
            //添加权限申请
            boolean saveAlbumPermission = PermissionHelper.hasPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
            if(!saveAlbumPermission){
                PermissionHelper.requestPermission(this, 0, Manifest.permission.READ_EXTERNAL_STORAGE);
            }else{
                if (this.cordova != null) {
                    this.cordova.startActivityForResult((CordovaPlugin) this, intent, 0);
                }
            }
        }
        return true;
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_OK && data != null) {
            ArrayList<String> fileNames = data.getStringArrayListExtra("MULTIPLEFILENAMES");
            JSONArray res = new JSONArray(fileNames);
            this.callbackContext.success(res);
        } else if (resultCode == Activity.RESULT_CANCELED && data != null) {
            String error = data.getStringExtra("ERRORMESSAGE");
            this.callbackContext.error(error);
        } else if (resultCode == Activity.RESULT_CANCELED) {
            JSONArray res = new JSONArray();
            this.callbackContext.success(res);
        } else {
            this.callbackContext.error("No images selected");
        }
    }
}

这样问题就解决了。