private void deleteImage(String imgPath) {
    ContentResolver resolver = getContentResolver();
    Cursor cursor = MediaStore.Images.Media.query(resolver, MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new String[]{MediaStore.Images.Media._ID}, MediaStore.Images.Media.DATA + "=?",
            new String[]{imgPath}, null);
    boolean result = false;
    Uri uri = null;
    if (cursor.moveToFirst()) {
        long id = cursor.getLong(0);
        Uri contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        uri = ContentUris.withAppendedId(contentUri, id);
        int count = getContentResolver().delete(uri, null, null);
        result = count == 1;
    } else {

        Cursor cursor2 = MediaStore.Images.Media.query(resolver, MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
                new String[]{MediaStore.Images.Media._ID}, MediaStore.Images.Media.DATA + "=?",
                new String[]{imgPath}, null);
        if (cursor2.moveToFirst()) {
            long id = cursor2.getLong(0);
            Uri contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            uri = ContentUris.withAppendedId(contentUri, id);
            int count = getContentResolver().delete(uri, null, null);
            result = count == 1;
        }

    }
//更新到图库
    Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    intent.setData(Uri.fromFile(new File(imgPath)));
    sendBroadcast(intent);

}

Toast工具类

import android.os.Handler;
import android.os.Looper;
import android.view.Gravity;
import android.widget.TextView;
import android.widget.Toast;

/**
 * <pre>
 * 吐司相关工具类
 * </pre>
 */
public class ToastUtils {

    private ToastUtils() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    private static Toast sToast;
    private static Handler sHandler = new Handler(Looper.getMainLooper());
    private static boolean isJumpWhenMore;

    /**
     * 吐司初始化
     *
     * @param isJumpWhenMore 当连续弹出吐司时，是要弹出新吐司还是只修改文本内容
     *                       <p>{@code true}: 弹出新吐司<br>{@code false}: 只修改文本内容</p>
     *                       <p>如果为{@code false}的话可用来做显示任意时长的吐司</p>
     */
    public static void init(boolean isJumpWhenMore) {
        ToastUtils.isJumpWhenMore = isJumpWhenMore;
    }

    /**
     * 安全地显示短时吐司
     *
     * @param text 文本
     */
    public static void showShortToastSafe(final CharSequence text) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(text, Toast.LENGTH_SHORT);
            }
        });
    }

    /**
     * 安全地显示短时吐司
     *
     * @param resId 资源Id
     */
    public static void showShortToastSafe(final int resId) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(resId, Toast.LENGTH_SHORT);
            }
        });
    }

    /**
     * 安全地显示短时吐司
     *
     * @param resId 资源Id
     * @param args  参数
     */
    public static void showShortToastSafe(final int resId, final Object... args) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(resId, Toast.LENGTH_SHORT, args);
            }
        });
    }

    /**
     * 安全地显示短时吐司
     *
     * @param format 格式
     * @param args   参数
     */
    public static void showShortToastSafe(final String format, final Object... args) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(format, Toast.LENGTH_SHORT, args);
            }
        });
    }

    /**
     * 安全地显示长时吐司
     *
     * @param text 文本
     */
    public static void showLongToastSafe(final CharSequence text) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(text, Toast.LENGTH_LONG);
            }
        });
    }

    /**
     * 安全地显示长时吐司
     *
     * @param resId 资源Id
     */
    public static void showLongToastSafe(final int resId) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(resId, Toast.LENGTH_LONG);
            }
        });
    }

    /**
     * 安全地显示长时吐司
     *
     * @param resId 资源Id
     * @param args  参数
     */
    public static void showLongToastSafe(final int resId, final Object... args) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(resId, Toast.LENGTH_LONG, args);
            }
        });
    }

    /**
     * 安全地显示长时吐司
     *
     * @param format 格式
     * @param args   参数
     */
    public static void showLongToastSafe(final String format, final Object... args) {
        sHandler.post(new Runnable() {
            @Override
            public void run() {
                showToast(format, Toast.LENGTH_LONG, args);
            }
        });
    }

    /**
     * 显示短时吐司
     *
     * @param text 文本
     */
    public static void showShortToast(CharSequence text) {
        showToast(text, Toast.LENGTH_SHORT);
    }

    /**
     * 显示短时吐司
     *
     * @param resId 资源Id
     */
    public static void showShortToast(int resId) {
        showToast(resId, Toast.LENGTH_SHORT);
    }

    /**
     * 显示短时吐司
     *
     * @param resId 资源Id
     * @param args  参数
     */
    public static void showShortToast(int resId, Object... args) {
        showToast(resId, Toast.LENGTH_SHORT, args);
    }

    /**
     * 显示短时吐司
     *
     * @param format 格式
     * @param args   参数
     */
    public static void showShortToast(String format, Object... args) {
        showToast(format, Toast.LENGTH_SHORT, args);
    }

    /**
     * 显示长时吐司
     *
     * @param text 文本
     */
    public static void showLongToast(CharSequence text) {
        showToast(text, Toast.LENGTH_LONG);
    }

    /**
     * 显示长时吐司
     *
     * @param resId 资源Id
     */
    public static void showLongToast(int resId) {
        showToast(resId, Toast.LENGTH_LONG);
    }

    /**
     * 显示长时吐司
     *
     * @param resId 资源Id
     * @param args  参数
     */
    public static void showLongToast(int resId, Object... args) {
        showToast(resId, Toast.LENGTH_LONG, args);
    }

    /**
     * 显示长时吐司
     *
     * @param format 格式
     * @param args   参数
     */
    public static void showLongToast(String format, Object... args) {
        showToast(format, Toast.LENGTH_LONG, args);
    }

    /**
     * 显示吐司
     *
     * @param text     文本
     * @param duration 显示时长
     */
    private static void showToast(CharSequence text, int duration) {
        if (isJumpWhenMore) cancelToast();
        if (sToast == null) {
            sToast = Toast.makeText(Utils.getContext(), text, duration);
            TextView tv = (TextView) sToast.getView().findViewById(android.R.id.message);
            tv.setTextSize(17);
            sToast.setGravity(Gravity.CENTER,0,0);
        } else {
            sToast.setText(text);
            sToast.setDuration(duration);
        }
        sToast.show();
    }

    /**
     * 显示吐司
     *
     * @param resId    资源Id
     * @param duration 显示时长
     */
    private static void showToast(int resId, int duration) {
        showToast(Utils.getContext().getResources().getText(resId).toString(), duration);
    }

    /**
     * 显示吐司
     *
     * @param resId    资源Id
     * @param duration 显示时长
     * @param args     参数
     */
    private static void showToast(int resId, int duration, Object... args) {
        showToast(String.format(Utils.getString(resId), args), duration);
    }

    /**
     * 显示吐司
     *
     * @param format   格式
     * @param duration 显示时长
     * @param args     参数
     */
    private static void showToast(String format, int duration, Object... args) {
        showToast(String.format(format, args), duration);
    }

    /**
     * 取消吐司显示
     */
    public static void cancelToast() {
        if (sToast != null) {
            sToast.cancel();
            sToast = null;
        }
    }
}